51313021431 has 24 divisors (see below), whose sum is σ = 79597857024. Its totient is φ = 29317926960.

The previous prime is 51313021427. The next prime is 51313021439. The reversal of 51313021431 is 13412031315.

It is not a de Polignac number, because 51313021431 - 2² = 51313021427 is a prime.

It is a super-2 number, since 2×51313021431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51313021439) 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, 1433356 + ... + 1468718.

It is an arithmetic number, because the mean of its divisors is an integer number (3316577376).

Almost surely, 2^51313021431 is an apocalyptic number.

51313021431 is a deficient number, since it is larger than the sum of its proper divisors (28284835593).

51313021431 is a wasteful number, since it uses less digits than its factorization.

51313021431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45251 (or 45244 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 51313021431 its reverse (13412031315), we get a palindrome (64725052746).

The spelling of 51313021431 in words is "fifty-one billion, three hundred thirteen million, twenty-one thousand, four hundred thirty-one".