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51131637 = 325681293

51131637 has 6 divisors (see below), whose sum is σ = 73856822. Its totient is φ = 34087752.

The previous prime is 51131623. The next prime is 51131651. The reversal of 51131637 is 73613115.

51131637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51131623) and next prime (51131651).

It can be written as a sum of positive squares in only one way, i.e., 45684081 + 5447556 = 6759^2 + 2334^2 .

It is not a de Polignac number, because 51131637 - 24 = 51131621 is a prime.

It is a super-2 number, since 2×511316372 = 5228888604599538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51131637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131677) 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 5 ways as a sum of consecutive naturals, for example, 2840638 + ... + 2840655.

Almost surely, 251131637 is an apocalyptic number.

It is an amenable number.

51131637 is a deficient number, since it is larger than the sum of its proper divisors (22725185).

51131637 is a wasteful number, since it uses less digits than its factorization.

51131637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5681299 (or 5681296 counting only the distinct ones).

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

The square root of 51131637 is about 7150.6389225020. The cubic root of 51131637 is about 371.1617659238.

The spelling of 51131637 in words is "fifty-one million, one hundred thirty-one thousand, six hundred thirty-seven".

Divisors: 1 3 9 5681293 17043879 51131637