51688807 has 2 divisors, whose sum is σ = 51688808. Its totient is φ = 51688806.

The previous prime is 51688771. The next prime is 51688829. The reversal of 51688807 is 70888615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51688807 - 2²³ = 43300199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51688837) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25844403 + 25844404.

It is an arithmetic number, because the mean of its divisors is an integer number (25844404).

Almost surely, 2^51688807 is an apocalyptic number.

51688807 is a deficient number, since it is larger than the sum of its proper divisors (1).

51688807 is an equidigital number, since it uses as much as digits as its factorization.

51688807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 51688807 is about 7189.4928193858. The cubic root of 51688807 is about 372.5050540581.

The spelling of 51688807 in words is "fifty-one million, six hundred eighty-eight thousand, eight hundred seven".