51715631 has 4 divisors (see below), whose sum is σ = 56417064. Its totient is φ = 47014200.

The previous prime is 51715621. The next prime is 51715633. The reversal of 51715631 is 13651715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51715631 - 2⁶ = 51715567 is a prime.

It is a super-2 number, since 2×51715631² = 5349012979456322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51715594 and 51715603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51715633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2350700 + ... + 2350721.

It is an arithmetic number, because the mean of its divisors is an integer number (14104266).

Almost surely, 2^51715631 is an apocalyptic number.

51715631 is a deficient number, since it is larger than the sum of its proper divisors (4701433).

51715631 is a wasteful number, since it uses less digits than its factorization.

51715631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701432.

The product of its digits is 3150, while the sum is 29.

The square root of 51715631 is about 7191.3580775817. The cubic root of 51715631 is about 372.5694803055.

The spelling of 51715631 in words is "fifty-one million, seven hundred fifteen thousand, six hundred thirty-one".