23515313 has 12 divisors (see below), whose sum is σ = 24566220. Its totient is φ = 22505472.

The previous prime is 23515309. The next prime is 23515321. The reversal of 23515313 is 31351532.

23515313 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in 6 ways, for example, as 552049 + 22963264 = 743^2 + 4792^2 .

It is not a de Polignac number, because 23515313 - 2² = 23515309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23515343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121745 + ... + 121937.

It is an arithmetic number, because the mean of its divisors is an integer number (2047185).

Almost surely, 2^23515313 is an apocalyptic number.

It is an amenable number.

23515313 is a deficient number, since it is larger than the sum of its proper divisors (1050907).

23515313 is an equidigital number, since it uses as much as digits as its factorization.

23515313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 319 counting only the distinct ones).

The product of its digits is 1350, while the sum is 23.

The square root of 23515313 is about 4849.2590155610. The cubic root of 23515313 is about 286.4949171016.

Adding to 23515313 its reverse (31351532), we get a palindrome (54866845).

The spelling of 23515313 in words is "twenty-three million, five hundred fifteen thousand, three hundred thirteen".