51407979 has 16 divisors (see below), whose sum is σ = 78557952. Its totient is φ = 29292768.

The previous prime is 51407971. The next prime is 51407999. The reversal of 51407979 is 97970415.

It is a happy number.

It is not a de Polignac number, because 51407979 - 2³ = 51407971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51407979.

It is not an unprimeable number, because it can be changed into a prime (51407971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4552 + ... + 11114.

It is an arithmetic number, because the mean of its divisors is an integer number (4909872).

Almost surely, 2^51407979 is an apocalyptic number.

51407979 is a deficient number, since it is larger than the sum of its proper divisors (27149973).

51407979 is a wasteful number, since it uses less digits than its factorization.

51407979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6946.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 51407979 is about 7169.9357737709. The cubic root of 51407979 is about 371.8292154541.

The spelling of 51407979 in words is "fifty-one million, four hundred seven thousand, nine hundred seventy-nine".