Compare 661987 vs 661991

Property	661987	661991
Type	prime	composite number
Unique factors	1	2
Total factors	1	3
Prime factorization	661987¹	11² × 5471¹
Prime factorization	661987	11 × 11 × 5471
Divisors count	2	6
Divisors	1, 661987	1, 11, 121, 5471, 60181, 661991
Number of properties	5	0
Additive primes	20970th
Chen primes	21009th
Isolated primes	42127th
Primes	53716th
Sexy primes (1st member)	11599th
Roman numberals
Base 2	10100001100111100011₂	10100001100111100111₂
Base 3	1020122002001₃	1020122002012₃
Base 4	2201213203₄	2201213213₄
Base 5	132140422₅	132140431₅
Base 6	22104431₆	22104435₆
Base 7	5424664₇	5425001₇
Base 8	2414743₈	2414747₈
Base 9	1218061₉	1218065₉
Base 10	661987₁₀	661991₁₀
Base 11	4123a7₁₁	412400₁₁
Base 12	27b117₁₂	27b11b₁₂
Base 13	1a2411₁₃	1a2415₁₃
Base 14	13336b₁₄	133371₁₄
Base 15	d1227₁₅	d122b₁₅
Base 16	a19e3₁₆	a19e7₁₆