51008693 has 2 divisors, whose sum is σ = 51008694. Its totient is φ = 51008692.

The previous prime is 51008669. The next prime is 51008723. The reversal of 51008693 is 39680015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51008164 + 529 = 7142^2 + 23^2 .

It is a cyclic number.

It is not a de Polignac number, because 51008693 - 2⁸ = 51008437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51008623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25504346 + 25504347.

It is an arithmetic number, because the mean of its divisors is an integer number (25504347).

Almost surely, 2^51008693 is an apocalyptic number.

It is an amenable number.

51008693 is a deficient number, since it is larger than the sum of its proper divisors (1).

51008693 is an equidigital number, since it uses as much as digits as its factorization.

51008693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 51008693 is about 7142.0370343481. The cubic root of 51008693 is about 370.8640459126.

The spelling of 51008693 in words is "fifty-one million, eight thousand, six hundred ninety-three".