51811979 has 2 divisors, whose sum is σ = 51811980. Its totient is φ = 51811978.

The previous prime is 51811967. The next prime is 51812011. The reversal of 51811979 is 97911815.

51811979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51811979 - 2²⁰ = 50763403 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51811379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25905989 + 25905990.

It is an arithmetic number, because the mean of its divisors is an integer number (25905990).

Almost surely, 2^51811979 is an apocalyptic number.

51811979 is a deficient number, since it is larger than the sum of its proper divisors (1).

51811979 is an equidigital number, since it uses as much as digits as its factorization.

51811979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 41.

The square root of 51811979 is about 7198.0538341971. The cubic root of 51811979 is about 372.8007066911.

The spelling of 51811979 in words is "fifty-one million, eight hundred eleven thousand, nine hundred seventy-nine".