51779831 has 4 divisors (see below), whose sum is σ = 54031152. Its totient is φ = 49528512.

The previous prime is 51779821. The next prime is 51779879. The reversal of 51779831 is 13897715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51779831 - 2¹⁰ = 51778807 is a prime.

It is a super-2 number, since 2×51779831² = 5362301796777122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51779801) 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, 1125626 + ... + 1125671.

It is an arithmetic number, because the mean of its divisors is an integer number (13507788).

Almost surely, 2^51779831 is an apocalyptic number.

51779831 is a deficient number, since it is larger than the sum of its proper divisors (2251321).

51779831 is a wasteful number, since it uses less digits than its factorization.

51779831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251320.

The product of its digits is 52920, while the sum is 41.

The square root of 51779831 is about 7195.8203840841. The cubic root of 51779831 is about 372.7235863227.

The spelling of 51779831 in words is "fifty-one million, seven hundred seventy-nine thousand, eight hundred thirty-one".