12531531 has 8 divisors (see below), whose sum is σ = 16732224. Its totient is φ = 8342600.

The previous prime is 12531529. The next prime is 12531539. The reversal of 12531531 is 13513521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12531531 - 2¹ = 12531529 is a prime.

It is a super-2 number, since 2×12531531² = 314078538407922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12531498 and 12531507.

It is not an unprimeable number, because it can be changed into a prime (12531539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45 + ... + 5006.

It is an arithmetic number, because the mean of its divisors is an integer number (2091528).

Almost surely, 2^12531531 is an apocalyptic number.

12531531 is a deficient number, since it is larger than the sum of its proper divisors (4200693).

12531531 is an equidigital number, since it uses as much as digits as its factorization.

12531531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5881.

The product of its digits is 450, while the sum is 21.

The square root of 12531531 is about 3539.9902542239. The cubic root of 12531531 is about 232.2744164158.

The spelling of 12531531 in words is "twelve million, five hundred thirty-one thousand, five hundred thirty-one".