51631131 has 4 divisors (see below), whose sum is σ = 68841512. Its totient is φ = 34420752.

The previous prime is 51631127. The next prime is 51631141. The reversal of 51631131 is 13113615.

51631131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51631131 - 2² = 51631127 is a prime.

It is a super-2 number, since 2×51631131² = 5331547376678322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51631098 and 51631107.

It is not an unprimeable number, because it can be changed into a prime (51631141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8605186 + ... + 8605191.

It is an arithmetic number, because the mean of its divisors is an integer number (17210378).

Almost surely, 2^51631131 is an apocalyptic number.

51631131 is a deficient number, since it is larger than the sum of its proper divisors (17210381).

51631131 is a wasteful number, since it uses less digits than its factorization.

51631131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17210380.

The product of its digits is 270, while the sum is 21.

The square root of 51631131 is about 7185.4805684797. The cubic root of 51631131 is about 372.3664515329.

Adding to 51631131 its reverse (13113615), we get a palindrome (64744746).

The spelling of 51631131 in words is "fifty-one million, six hundred thirty-one thousand, one hundred thirty-one".