23131215 has 24 divisors (see below), whose sum is σ = 41839200. Its totient is φ = 11799744.

The previous prime is 23131211. The next prime is 23131231. The reversal of 23131215 is 51213132.

It is not a de Polignac number, because 23131215 - 2² = 23131211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131211) 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, 10140 + ... + 12209.

It is an arithmetic number, because the mean of its divisors is an integer number (1743300).

Almost surely, 2^23131215 is an apocalyptic number.

23131215 is a deficient number, since it is larger than the sum of its proper divisors (18707985).

23131215 is a wasteful number, since it uses less digits than its factorization.

23131215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22383 (or 22380 counting only the distinct ones).

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

The square root of 23131215 is about 4809.4921769351. The cubic root of 23131215 is about 284.9264814985.

Adding to 23131215 its reverse (51213132), we get a palindrome (74344347).

The spelling of 23131215 in words is "twenty-three million, one hundred thirty-one thousand, two hundred fifteen".