51320179831 has 4 divisors (see below), whose sum is σ = 51588872064. Its totient is φ = 51051487600.

The previous prime is 51320179829. The next prime is 51320179837. The reversal of 51320179831 is 13897102315.

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 51320179831 - 2¹ = 51320179829 is a prime.

It is a super-2 number, since 2×51320179831² (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 (51320179837) 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, 134345830 + ... + 134346211.

It is an arithmetic number, because the mean of its divisors is an integer number (12897218016).

Almost surely, 2^51320179831 is an apocalyptic number.

51320179831 is a deficient number, since it is larger than the sum of its proper divisors (268692233).

51320179831 is a wasteful number, since it uses less digits than its factorization.

51320179831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268692232.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 51320179831 in words is "fifty-one billion, three hundred twenty million, one hundred seventy-nine thousand, eight hundred thirty-one".