51659831 has 2 divisors, whose sum is σ = 51659832. Its totient is φ = 51659830.

The previous prime is 51659809. The next prime is 51659833. The reversal of 51659831 is 13895615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51659831 - 2²² = 47465527 is a prime.

It is a super-2 number, since 2×51659831² = 5337476277897122, which contains 22 as substring.

Together with 51659833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51659833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25829915 + 25829916.

It is an arithmetic number, because the mean of its divisors is an integer number (25829916).

Almost surely, 2^51659831 is an apocalyptic number.

51659831 is a deficient number, since it is larger than the sum of its proper divisors (1).

51659831 is an equidigital number, since it uses as much as digits as its factorization.

51659831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 51659831 is about 7187.4773738774. The cubic root of 51659831 is about 372.4354340596.

The spelling of 51659831 in words is "fifty-one million, six hundred fifty-nine thousand, eight hundred thirty-one".