51293631 has 4 divisors (see below), whose sum is σ = 68391512. Its totient is φ = 34195752.

The previous prime is 51293629. The next prime is 51293633. The reversal of 51293631 is 13639215.

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

It is an interprime number because it is at equal distance from previous prime (51293629) and next prime (51293633).

It is not a de Polignac number, because 51293631 - 2¹ = 51293629 is a prime.

It is a super-2 number, since 2×51293631² = 5262073162328322, which 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 (51293633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8548936 + ... + 8548941.

It is an arithmetic number, because the mean of its divisors is an integer number (17097878).

Almost surely, 2^51293631 is an apocalyptic number.

51293631 is a deficient number, since it is larger than the sum of its proper divisors (17097881).

51293631 is a wasteful number, since it uses less digits than its factorization.

51293631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17097880.

The product of its digits is 4860, while the sum is 30.

The square root of 51293631 is about 7161.9572045636. The cubic root of 51293631 is about 371.5533212478.

It can be divided in two parts, 5 and 1293631, that added together give a triangular number (1293636 = T₁₆₀₈).

The spelling of 51293631 in words is "fifty-one million, two hundred ninety-three thousand, six hundred thirty-one".