51320022031 has 4 divisors (see below), whose sum is σ = 51774181632. Its totient is φ = 50865862432.

The previous prime is 51320021939. The next prime is 51320022041. The reversal of 51320022031 is 13022002315.

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 51320022031 - 2¹³ = 51320013839 is a prime.

It is a super-2 number, since 2×51320022031² (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 (51320022041) 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, 227079631 + ... + 227079856.

It is an arithmetic number, because the mean of its divisors is an integer number (12943545408).

Almost surely, 2^51320022031 is an apocalyptic number.

51320022031 is a deficient number, since it is larger than the sum of its proper divisors (454159601).

51320022031 is a wasteful number, since it uses less digits than its factorization.

51320022031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454159600.

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 51320022031 its reverse (13022002315), we get a palindrome (64342024346).

The spelling of 51320022031 in words is "fifty-one billion, three hundred twenty million, twenty-two thousand, thirty-one".