51718689 has 16 divisors (see below), whose sum is σ = 83586240. Its totient is φ = 31344480.

The previous prime is 51718679. The next prime is 51718691. The reversal of 51718689 is 98681715.

It is not a de Polignac number, because 51718689 - 2⁴ = 51718673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51718679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86772 + ... + 87365.

It is an arithmetic number, because the mean of its divisors is an integer number (5224140).

Almost surely, 2^51718689 is an apocalyptic number.

It is an amenable number.

51718689 is a deficient number, since it is larger than the sum of its proper divisors (31867551).

51718689 is a wasteful number, since it uses less digits than its factorization.

51718689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174157 (or 174151 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 51718689 is about 7191.5706907462. The cubic root of 51718689 is about 372.5768236367.

The spelling of 51718689 in words is "fifty-one million, seven hundred eighteen thousand, six hundred eighty-nine".