51515595 has 40 divisors (see below), whose sum is σ = 92869920. Its totient is φ = 27319680.

The previous prime is 51515587. The next prime is 51515609. The reversal of 51515595 is 59551515.

It is a happy number.

51515595 is a `hidden beast` number, since 51 + 5 + 15 + 595 = 666.

It is not a de Polignac number, because 51515595 - 2³ = 51515587 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 125751 + ... + 126159.

It is an arithmetic number, because the mean of its divisors is an integer number (2321748).

Almost surely, 2^51515595 is an apocalyptic number.

51515595 is a deficient number, since it is larger than the sum of its proper divisors (41354325).

51515595 is a wasteful number, since it uses less digits than its factorization.

51515595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 728 counting only the distinct ones).

The product of its digits is 28125, while the sum is 36.

The square root of 51515595 is about 7177.4365200955. The cubic root of 51515595 is about 372.0884935151.

It can be divided in two parts, 515 and 15595, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 51515595 in words is "fifty-one million, five hundred fifteen thousand, five hundred ninety-five".