51636831 has 8 divisors (see below), whose sum is σ = 68983344. Its totient is φ = 34357440.

The previous prime is 51636811. The next prime is 51636839. The reversal of 51636831 is 13863615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51636831 - 2⁷ = 51636703 is a prime.

It is a super-2 number, since 2×51636831² = 5332724631445122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51636792 and 51636801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51636839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14956 + ... + 18081.

It is an arithmetic number, because the mean of its divisors is an integer number (8622918).

Almost surely, 2^51636831 is an apocalyptic number.

51636831 is a deficient number, since it is larger than the sum of its proper divisors (17346513).

51636831 is a wasteful number, since it uses less digits than its factorization.

51636831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33561.

The product of its digits is 12960, while the sum is 33.

The square root of 51636831 is about 7185.8771907123. The cubic root of 51636831 is about 372.3801539294.

The spelling of 51636831 in words is "fifty-one million, six hundred thirty-six thousand, eight hundred thirty-one".