51905404831 has 4 divisors (see below), whose sum is σ = 59320462672. Its totient is φ = 44490346992.

The previous prime is 51905404777. The next prime is 51905404843. The reversal of 51905404831 is 13840450915.

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

It is not a de Polignac number, because 51905404831 - 2⁹ = 51905404319 is a prime.

It is a super-2 number, since 2×51905404831² (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 (51905404861) 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, 3707528910 + ... + 3707528923.

It is an arithmetic number, because the mean of its divisors is an integer number (14830115668).

Almost surely, 2^51905404831 is an apocalyptic number.

51905404831 is a deficient number, since it is larger than the sum of its proper divisors (7415057841).

51905404831 is an equidigital number, since it uses as much as digits as its factorization.

51905404831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7415057840.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 51905404831 in words is "fifty-one billion, nine hundred five million, four hundred four thousand, eight hundred thirty-one".