23131512 has 96 divisors (see below), whose sum is σ = 67875600. Its totient is φ = 7091712.

The previous prime is 23131483. The next prime is 23131513. The reversal of 23131512 is 21513132.

23131512 is a `hidden beast` number, since 23 + 131 + 512 = 666.

It is a super-2 number, since 2×23131512² = 1070133694812288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50388 + ... + 50844.

Almost surely, 2^23131512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23131512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33937800).

23131512 is an abundant number, since it is smaller than the sum of its proper divisors (44744088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23131512 is a wasteful number, since it uses less digits than its factorization.

23131512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 518 counting only the distinct ones).

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

The square root of 23131512 is about 4809.5230532767. The cubic root of 23131512 is about 284.9277009589.

Adding to 23131512 its reverse (21513132), we get a palindrome (44644644).

The spelling of 23131512 in words is "twenty-three million, one hundred thirty-one thousand, five hundred twelve".