51715331 has 4 divisors (see below), whose sum is σ = 51854352. Its totient is φ = 51576312.

The previous prime is 51715327. The next prime is 51715337. The reversal of 51715331 is 13351715.

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 51715331 - 2² = 51715327 is a prime.

It is a super-2 number, since 2×51715331² = 5348950920879122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51715331.

It is not an unprimeable number, because it can be changed into a prime (51715337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68951 + ... + 69696.

It is an arithmetic number, because the mean of its divisors is an integer number (12963588).

Almost surely, 2^51715331 is an apocalyptic number.

51715331 is a deficient number, since it is larger than the sum of its proper divisors (139021).

51715331 is a wasteful number, since it uses less digits than its factorization.

51715331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139020.

The product of its digits is 1575, while the sum is 26.

The square root of 51715331 is about 7191.3372191825. The cubic root of 51715331 is about 372.5687598846.

The spelling of 51715331 in words is "fifty-one million, seven hundred fifteen thousand, three hundred thirty-one".