12312531 has 48 divisors (see below), whose sum is σ = 22513920. Its totient is φ = 6298560.

The previous prime is 12312511. The next prime is 12312557. The reversal of 12312531 is 13521321.

12312531 is a `hidden beast` number, since 123 + 12 + 531 = 666.

It is not a de Polignac number, because 12312531 - 2⁶ = 12312467 is a prime.

It is a super-2 number, since 2×12312531² = 303196839251922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12312511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75456 + ... + 75618.

It is an arithmetic number, because the mean of its divisors is an integer number (469040).

Almost surely, 2^12312531 is an apocalyptic number.

12312531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12312531 is a deficient number, since it is larger than the sum of its proper divisors (10201389).

12312531 is a wasteful number, since it uses less digits than its factorization.

12312531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 293 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 12312531 is about 3508.9216292189. The cubic root of 12312531 is about 230.9133874424.

Adding to 12312531 its reverse (13521321), we get a palindrome (25833852).

The spelling of 12312531 in words is "twelve million, three hundred twelve thousand, five hundred thirty-one".