Compare 1521 vs 1531

Property	1521	1531
Type	composite number	prime
Unique factors	2	1
Total factors	4	1
Prime factorization	3² × 13²	1531¹
Prime factorization	3 × 3 × 13 × 13	1531
Divisors count	9	2
Divisors	1, 3, 9, 13, 39, 117, 169, 507, 1521	1, 1531
Number of properties	0	5
Centered decagonal primes		13th
Isolated primes		143rd
Long primes		91st
Primes		242nd
Ulam primes		22nd
Roman numberals	MDXXI	MDXXXI
Base 2	10111110001₂	10111111011₂
Base 3	2002100₃	2002201₃
Base 4	113301₄	113323₄
Base 5	22041₅	22111₅
Base 6	11013₆	11031₆
Base 7	4302₇	4315₇
Base 8	2761₈	2773₈
Base 9	2070₉	2081₉
Base 10	1521₁₀	1531₁₀
Base 11	1163₁₁	1172₁₁
Base 12	a69₁₂	a77₁₂
Base 13	900₁₃	90a₁₃
Base 14	7a9₁₄	7b5₁₄
Base 15	6b6₁₅	6c1₁₅
Base 16	5f1₁₆	5fb₁₆