Number 19991

19991 is prime.

19991 prime factorization is 19991¹

19991 prime factorization is 19991

Divisors (2): 1, 19991

Properties#

19991 is 1049th additive prime because sum of its digits is 29 which is also prime
19991 is 1111th chen prime
19991 is 820th harmonic prime
19991 is 46th palindromic prime
19991 is 2260th prime
19991 is part of 168th prime triplet {19991, 19993, 19997}
19991 is part of 693rd sexy prime {19991, 19997}
19991 is 326th sophie germain prime, its corresponding Safe prime is 39983
19991 is part of 342nd twin prime {19991, 19993}

External#

Neighbours#

19979₆	19980	19981	19982	19983₁
19984	19985	19986	19987	19988
19989	19990	19991₉	19992	19993₈
19994	19995	19996	19997₉	19998
19999₁	20000	20001	20002	20003₁

Compare with#

19979₆	19980	19981	19982	19983₁
19984	19985	19986	19987	19988
19989	19990	19991₉	19992	19993₈
19994	19995	19996	19997₉	19998
19999₁	20000	20001	20002	20003₁

Different Representations#

19991 in base 2 is 100111000010111₂
19991 in base 3 is 1000102102₃
19991 in base 4 is 10320113₄
19991 in base 5 is 1114431₅
19991 in base 6 is 232315₆
19991 in base 7 is 112166₇
19991 in base 8 is 47027₈
19991 in base 9 is 30372₉
19991 in base 10 is 19991₁₀
19991 in base 11 is 14024₁₁
19991 in base 12 is b69b₁₂
19991 in base 13 is 913a₁₃
19991 in base 14 is 73dd₁₄
19991 in base 15 is 5dcb₁₅
19991 in base 16 is 4e17₁₆

Belongs Into#

19991 belongs into first 1000 additive primes.
19991 belongs into first 1000 chen primes.
19991 belongs into first 1000 harmonic primes.
19991 belongs into first 50 palindromic primes.
19991 belongs into first 1000 primes.
19991 belongs into first 500 prime triplets.
19991 belongs into first 1000 sexy primes.
19991 belongs into first 500 sophie germain primes.
19991 belongs into first 500 twin primes.

As Timestamp#

0 + 1 * 19991: Convert timestamp 19991 to date is 1970-01-01 05:33:11
0 + 1000 * 19991: Convert timestamp 19991000 to date is 1970-08-20 09:03:20
1300000000 + 1000 * 19991: Convert timestamp 1319991000 to date is 2011-10-30 16:10:00
1400000000 + 1000 * 19991: Convert timestamp 1419991000 to date is 2014-12-31 01:56:40
1500000000 + 1000 * 19991: Convert timestamp 1519991000 to date is 2018-03-02 11:43:20
1600000000 + 1000 * 19991: Convert timestamp 1619991000 to date is 2021-05-02 21:30:00
1700000000 + 1000 * 19991: Convert timestamp 1719991000 to date is 2024-07-03 07:16:40

You May Also Ask#

Smaller than 19991#

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