1. Numbers
  2. Compare 990 vs 991

Compare 990 vs 991

Property990991
Typecomposite numberprime
Unique factors41
Total factors51
Prime factorization21 × 32 × 51 × 1119911
Prime factorization2 × 3 × 3 × 5 × 11991
Divisors count242
Divisors1, 2, 3, 5, 6, 9, 10, 11, 15, 18, 22, 30, 33, 45, 55, 66, 90, 99, 110, 165, 198, 330, 495, 9901, 991
Number of properties010
Additive primes 89th
Chen primes 115th
Emirps 36th
Isolated primes 98th
Lucky primes 42nd
Primes 167th
Sexy primes (1st member) 74th
Solinas primes 43rd
Super primes 39th
Ulam primes 18th
Roman numberalsCMXCCMXCI
Base 21111011110211110111112
Base 31100200311002013
Base 4331324331334
Base 5124305124315
Base 64330643316
Base 72613726147
Base 81736817378
Base 91320913219
Base 109901099110
Base 118201182111
Base 126a6126a712
Base 135b2135b313
Base 1450a1450b14
Base 154601546115
Base 163de163df16
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