51979569 has 4 divisors (see below), whose sum is σ = 69306096. Its totient is φ = 34653044.

The previous prime is 51979567. The next prime is 51979579. The reversal of 51979569 is 96597915.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51979569 - 2¹ = 51979567 is a prime.

It is a super-2 number, since 2×51979569² = 5403751186851522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51979567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8663259 + ... + 8663264.

It is an arithmetic number, because the mean of its divisors is an integer number (17326524).

Almost surely, 2^51979569 is an apocalyptic number.

It is an amenable number.

51979569 is a deficient number, since it is larger than the sum of its proper divisors (17326527).

51979569 is a wasteful number, since it uses less digits than its factorization.

51979569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17326526.

The product of its digits is 765450, while the sum is 51.

The square root of 51979569 is about 7209.6857767867. The cubic root of 51979569 is about 373.2022253451.

The spelling of 51979569 in words is "fifty-one million, nine hundred seventy-nine thousand, five hundred sixty-nine".