51979489 has 4 divisors (see below), whose sum is σ = 55037124. Its totient is φ = 48921856.

The previous prime is 51979483. The next prime is 51979493. The reversal of 51979489 is 98497915.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 32398864 = 4425^2 + 5692^2 .

It is a cyclic number.

It is not a de Polignac number, because 51979489 - 2³ = 51979481 is a prime.

It is a super-2 number, since 2×51979489² = 5403734553402242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51979481) 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, 1528792 + ... + 1528825.

It is an arithmetic number, because the mean of its divisors is an integer number (13759281).

Almost surely, 2^51979489 is an apocalyptic number.

It is an amenable number.

51979489 is a deficient number, since it is larger than the sum of its proper divisors (3057635).

51979489 is a wasteful number, since it uses less digits than its factorization.

51979489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057634.

The product of its digits is 816480, while the sum is 52.

The square root of 51979489 is about 7209.6802286925. The cubic root of 51979489 is about 373.2020338840.

It can be divided in two parts, 519 and 79489, that added together give a palindrome (80008).

The spelling of 51979489 in words is "fifty-one million, nine hundred seventy-nine thousand, four hundred eighty-nine".