Compare 663985 vs 663991

Property	663985	663991
Type	composite number	prime
Unique factors	4	1
Total factors	4	1
Prime factorization	5¹ × 7¹ × 61¹ × 311¹	663991¹
Prime factorization	5 × 7 × 61 × 311	663991
Divisors count	16	2
Divisors	1, 5, 7, 35, 61, 305, 311, 427, 1555, 2135, 2177, 10885, 18971, 94855, 132797, 663985	1, 663991
Number of properties	0	3
Isolated primes		42236th
Primes		53867th
Sexy primes (1st member)		11629th
Roman numberals
Base 2	10100010000110110001₂	10100010000110110111₂
Base 3	1020201211001₃	1020201211021₃
Base 4	2202012301₄	2202012313₄
Base 5	132221420₅	132221431₅
Base 6	22122001₆	22122011₆
Base 7	5433550₇	5433556₇
Base 8	2420661₈	2420667₈
Base 9	1221731₉	1221737₉
Base 10	663985₁₀	663991₁₀
Base 11	413953₁₁	413959₁₁
Base 12	280301₁₂	280307₁₂
Base 13	1a32ba₁₃	1a32c3₁₃
Base 14	133d97₁₄	133d9d₁₄
Base 15	d1b0a₁₅	d1b11₁₅
Base 16	a21b1₁₆	a21b7₁₆