Compare 688 vs 691

Property	688	691
Type	composite number	prime
Unique factors	2	1
Total factors	5	1
Prime factorization	2⁴ × 43¹	691¹
Prime factorization	2 × 2 × 2 × 2 × 43	691
Divisors count	10	2
Divisors	1, 2, 4, 8, 16, 43, 86, 172, 344, 688	1, 691
Number of properties	0	3
Harmonic primes		50th
Isolated primes		66th
Primes		125th
Roman numberals	DCLXXXVIII	DCXCI
Base 2	1010110000₂	1010110011₂
Base 3	221111₃	221121₃
Base 4	22300₄	22303₄
Base 5	10223₅	10231₅
Base 6	3104₆	3111₆
Base 7	2002₇	2005₇
Base 8	1260₈	1263₈
Base 9	844₉	847₉
Base 10	688₁₀	691₁₀
Base 11	576₁₁	579₁₁
Base 12	494₁₂	497₁₂
Base 13	40c₁₃	412₁₃
Base 14	372₁₄	375₁₄
Base 15	30d₁₅	311₁₅
Base 16	2b0₁₆	2b3₁₆