23131015 has 4 divisors (see below), whose sum is σ = 27757224. Its totient is φ = 18504808.

The previous prime is 23131001. The next prime is 23131027. The reversal of 23131015 is 51013132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23131015 - 2⁵ = 23130983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23131015.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2313097 + ... + 2313106.

It is an arithmetic number, because the mean of its divisors is an integer number (6939306).

Almost surely, 2^23131015 is an apocalyptic number.

23131015 is a deficient number, since it is larger than the sum of its proper divisors (4626209).

23131015 is an equidigital number, since it uses as much as digits as its factorization.

23131015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626208.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 23131015 is about 4809.4713846742. The cubic root of 23131015 is about 284.9256603072.

Adding to 23131015 its reverse (51013132), we get a palindrome (74144147).

The spelling of 23131015 in words is "twenty-three million, one hundred thirty-one thousand, fifteen".