51115979 has 2 divisors, whose sum is σ = 51115980. Its totient is φ = 51115978.

The previous prime is 51115973. The next prime is 51116011. The reversal of 51115979 is 97951115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51115979 - 2⁸ = 51115723 is a prime.

It is a super-2 number, since 2×51115979² = 5225686618256882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51115973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25557989 + 25557990.

It is an arithmetic number, because the mean of its divisors is an integer number (25557990).

Almost surely, 2^51115979 is an apocalyptic number.

51115979 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115979 is an equidigital number, since it uses as much as digits as its factorization.

51115979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14175, while the sum is 38.

The square root of 51115979 is about 7149.5439714712. The cubic root of 51115979 is about 371.1238751996.

The spelling of 51115979 in words is "fifty-one million, one hundred fifteen thousand, nine hundred seventy-nine".