51715731 has 4 divisors (see below), whose sum is σ = 68954312. Its totient is φ = 34477152.

The previous prime is 51715709. The next prime is 51715747. The reversal of 51715731 is 13751715.

51715731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51715731 - 2⁶ = 51715667 is a prime.

It is a super-2 number, since 2×51715731² = 5349033665728722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51715231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8619286 + ... + 8619291.

It is an arithmetic number, because the mean of its divisors is an integer number (17238578).

Almost surely, 2^51715731 is an apocalyptic number.

51715731 is a deficient number, since it is larger than the sum of its proper divisors (17238581).

51715731 is a wasteful number, since it uses less digits than its factorization.

51715731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17238580.

The product of its digits is 3675, while the sum is 30.

The square root of 51715731 is about 7191.3650303680. The cubic root of 51715731 is about 372.5697204452.

The spelling of 51715731 in words is "fifty-one million, seven hundred fifteen thousand, seven hundred thirty-one".