51513616231 has 16 divisors (see below), whose sum is σ = 64232478720. Its totient is φ = 40135661280.

The previous prime is 51513616213. The next prime is 51513616243. The reversal of 51513616231 is 13261631515.

It is not a de Polignac number, because 51513616231 - 2¹³ = 51513608039 is a prime.

It is a super-2 number, since 2×51513616231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51513616211) 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, 691365 + ... + 762241.

It is an arithmetic number, because the mean of its divisors is an integer number (4014529920).

Almost surely, 2^51513616231 is an apocalyptic number.

51513616231 is a deficient number, since it is larger than the sum of its proper divisors (12718862489).

51513616231 is a wasteful number, since it uses less digits than its factorization.

51513616231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80334.

The product of its digits is 16200, while the sum is 34.

The spelling of 51513616231 in words is "fifty-one billion, five hundred thirteen million, six hundred sixteen thousand, two hundred thirty-one".