51331313 has 24 divisors (see below), whose sum is σ = 60623904. Its totient is φ = 43084800.

The previous prime is 51331253. The next prime is 51331327. The reversal of 51331313 is 31313315.

It is not a de Polignac number, because 51331313 - 2⁶ = 51331249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51331013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212873 + ... + 213113.

It is an arithmetic number, because the mean of its divisors is an integer number (2525996).

Almost surely, 2^51331313 is an apocalyptic number.

It is an amenable number.

51331313 is a deficient number, since it is larger than the sum of its proper divisors (9292591).

51331313 is a wasteful number, since it uses less digits than its factorization.

51331313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 336 counting only the distinct ones).

The product of its digits is 405, while the sum is 20.

The square root of 51331313 is about 7164.5874270610. The cubic root of 51331313 is about 371.6442841015.

Adding to 51331313 its reverse (31313315), we get a palindrome (82644628).

It can be divided in two parts, 5133 and 1313, that added together give a palindrome (6446).

The spelling of 51331313 in words is "fifty-one million, three hundred thirty-one thousand, three hundred thirteen".