51601995 has 32 divisors (see below), whose sum is σ = 95731200. Its totient is φ = 26322912.

The previous prime is 51601981. The next prime is 51602027. The reversal of 51601995 is 59910615.

It is not a de Polignac number, because 51601995 - 2¹⁵ = 51569227 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5205 + ... + 11414.

It is an arithmetic number, because the mean of its divisors is an integer number (2991600).

Almost surely, 2^51601995 is an apocalyptic number.

51601995 is a deficient number, since it is larger than the sum of its proper divisors (44129205).

51601995 is a wasteful number, since it uses less digits than its factorization.

51601995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16656 (or 16650 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 51601995 is about 7183.4528605678. The cubic root of 51601995 is about 372.2963948950.

The spelling of 51601995 in words is "fifty-one million, six hundred one thousand, nine hundred ninety-five".