23131322013 has 16 divisors (see below), whose sum is σ = 31236578816. Its totient is φ = 15224727600.

The previous prime is 23131321999. The next prime is 23131322021. The reversal of 23131322013 is 31022313132.

It is not a de Polignac number, because 23131322013 - 2⁸ = 23131321757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131322033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82795 + ... + 230472.

It is an arithmetic number, because the mean of its divisors is an integer number (1952286176).

Almost surely, 2^23131322013 is an apocalyptic number.

It is an amenable number.

23131322013 is a deficient number, since it is larger than the sum of its proper divisors (8105256803).

23131322013 is a wasteful number, since it uses less digits than its factorization.

23131322013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313584.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 23131322013 its reverse (31022313132), we get a palindrome (54153635145).

The spelling of 23131322013 in words is "twenty-three billion, one hundred thirty-one million, three hundred twenty-two thousand, thirteen".