51530715 has 32 divisors (see below), whose sum is σ = 91929600. Its totient is φ = 27387360.

The previous prime is 51530707. The next prime is 51530719. The reversal of 51530715 is 51703515.

It is not a de Polignac number, because 51530715 - 2³ = 51530707 is a prime.

It is a super-2 number, since 2×51530715² = 5310829176822450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51530719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56110 + ... + 57020.

It is an arithmetic number, because the mean of its divisors is an integer number (2872800).

Almost surely, 2^51530715 is an apocalyptic number.

51530715 is a deficient number, since it is larger than the sum of its proper divisors (40398885).

51530715 is a wasteful number, since it uses less digits than its factorization.

51530715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1338 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 27.

The square root of 51530715 is about 7178.4897436717. The cubic root of 51530715 is about 372.1248930281.

The spelling of 51530715 in words is "fifty-one million, five hundred thirty thousand, seven hundred fifteen".