51631477 has 4 divisors (see below), whose sum is σ = 52285120. Its totient is φ = 50977836.

The previous prime is 51631457. The next prime is 51631483. The reversal of 51631477 is 77413615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51631477 - 2²³ = 43242869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51631457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326703 + ... + 326860.

It is an arithmetic number, because the mean of its divisors is an integer number (13071280).

Almost surely, 2^51631477 is an apocalyptic number.

It is an amenable number.

51631477 is a deficient number, since it is larger than the sum of its proper divisors (653643).

51631477 is an equidigital number, since it uses as much as digits as its factorization.

51631477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653642.

The product of its digits is 17640, while the sum is 34.

The square root of 51631477 is about 7185.5046447692. The cubic root of 51631477 is about 372.3672833212.

The spelling of 51631477 in words is "fifty-one million, six hundred thirty-one thousand, four hundred seventy-seven".