51631731 has 6 divisors (see below), whose sum is σ = 74579180. Its totient is φ = 34421148.

The previous prime is 51631663. The next prime is 51631747. The reversal of 51631731 is 13713615.

It is not a de Polignac number, because 51631731 - 2⁷ = 51631603 is a prime.

It is a super-2 number, since 2×51631731² = 5331671292112722, 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 = 51631695 and 51631704.

It is not an unprimeable number, because it can be changed into a prime (51631781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2868421 + ... + 2868438.

Almost surely, 2^51631731 is an apocalyptic number.

51631731 is a deficient number, since it is larger than the sum of its proper divisors (22947449).

51631731 is a wasteful number, since it uses less digits than its factorization.

51631731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736865 (or 5736862 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 51631731 is about 7185.5223192194. The cubic root of 51631731 is about 372.3678939379.

The spelling of 51631731 in words is "fifty-one million, six hundred thirty-one thousand, seven hundred thirty-one".