51465631 has 12 divisors (see below), whose sum is σ = 61488408. Its totient is φ = 42919632.

The previous prime is 51465599. The next prime is 51465649. The reversal of 51465631 is 13656415.

It is not a de Polignac number, because 51465631 - 2⁵ = 51465599 is a prime.

It is a super-2 number, since 2×51465631² = 5297422348456322, 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 = 51465593 and 51465602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51465031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12381 + ... + 16006.

It is an arithmetic number, because the mean of its divisors is an integer number (5124034).

Almost surely, 2^51465631 is an apocalyptic number.

51465631 is a deficient number, since it is larger than the sum of its proper divisors (10022777).

51465631 is a wasteful number, since it uses less digits than its factorization.

51465631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28438 (or 28431 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 51465631 is about 7173.9550458586. The cubic root of 51465631 is about 371.9681607428.

The spelling of 51465631 in words is "fifty-one million, four hundred sixty-five thousand, six hundred thirty-one".