51686017 has 2 divisors, whose sum is σ = 51686018. Its totient is φ = 51686016.

The previous prime is 51685973. The next prime is 51686039. The reversal of 51686017 is 71068615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49224256 + 2461761 = 7016^2 + 1569^2 .

It is a cyclic number.

It is not a de Polignac number, because 51686017 - 2¹¹ = 51683969 is a prime.

It is not a weakly prime, because it can be changed into another prime (51686057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25843008 + 25843009.

It is an arithmetic number, because the mean of its divisors is an integer number (25843009).

Almost surely, 2^51686017 is an apocalyptic number.

It is an amenable number.

51686017 is a deficient number, since it is larger than the sum of its proper divisors (1).

51686017 is an equidigital number, since it uses as much as digits as its factorization.

51686017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 51686017 is about 7189.2987836089. The cubic root of 51686017 is about 372.4983517186.

The spelling of 51686017 in words is "fifty-one million, six hundred eighty-six thousand, seventeen".