51513100231 has 4 divisors (see below), whose sum is σ = 52091899200. Its totient is φ = 50934301264.

The previous prime is 51513100097. The next prime is 51513100237. The reversal of 51513100231 is 13200131515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51513100231 - 2⁹ = 51513099719 is a prime.

It is a super-2 number, since 2×51513100231² (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 (51513100237) 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, 289399351 + ... + 289399528.

It is an arithmetic number, because the mean of its divisors is an integer number (13022974800).

Almost surely, 2^51513100231 is an apocalyptic number.

51513100231 is a deficient number, since it is larger than the sum of its proper divisors (578798969).

51513100231 is an equidigital number, since it uses as much as digits as its factorization.

51513100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578798968.

The product of its (nonzero) digits is 450, while the sum is 22.

Adding to 51513100231 its reverse (13200131515), we get a palindrome (64713231746).

The spelling of 51513100231 in words is "fifty-one billion, five hundred thirteen million, one hundred thousand, two hundred thirty-one".