23131313 has 4 divisors (see below), whose sum is σ = 23140980. Its totient is φ = 23121648.

The previous prime is 23131289. The next prime is 23131333. The reversal of 23131313 is 31313132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11888704 + 11242609 = 3448^2 + 3353^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131313 - 2⁶ = 23131249 is a prime.

It is a super-2 number, since 2×23131313² = 1070115282207938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131291 and 23131300.

It is not an unprimeable number, because it can be changed into a prime (23131333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (5785245).

Almost surely, 2^23131313 is an apocalyptic number.

It is an amenable number.

23131313 is a deficient number, since it is larger than the sum of its proper divisors (9667).

23131313 is an equidigital number, since it uses as much as digits as its factorization.

23131313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9666.

The product of its digits is 162, while the sum is 17.

The square root of 23131313 is about 4809.5023651101. The cubic root of 23131313 is about 284.9268838805.

Adding to 23131313 its reverse (31313132), we get a palindrome (54444445).

It can be divided in two parts, 2 and 3131313, that multiplied together give a palindrome (6262626).

The spelling of 23131313 in words is "twenty-three million, one hundred thirty-one thousand, three hundred thirteen".