51679805 has 4 divisors (see below), whose sum is σ = 62015772. Its totient is φ = 41343840.

The previous prime is 51679801. The next prime is 51679807. The reversal of 51679805 is 50897615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50897615 = 5 ⋅10179523.

It can be written as a sum of positive squares in 2 ways, for example, as 20016676 + 31663129 = 4474^2 + 5627^2 .

It is not a de Polignac number, because 51679805 - 2² = 51679801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51679801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5167976 + ... + 5167985.

It is an arithmetic number, because the mean of its divisors is an integer number (15503943).

Almost surely, 2^51679805 is an apocalyptic number.

It is an amenable number.

51679805 is a deficient number, since it is larger than the sum of its proper divisors (10335967).

51679805 is a wasteful number, since it uses less digits than its factorization.

51679805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10335966.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 51679805 is about 7188.8667396190. The cubic root of 51679805 is about 372.4834279371.

The spelling of 51679805 in words is "fifty-one million, six hundred seventy-nine thousand, eight hundred five".