55615979 has 2 divisors, whose sum is σ = 55615980. Its totient is φ = 55615978.

The previous prime is 55615969. The next prime is 55615981. The reversal of 55615979 is 97951655.

55615979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55615979 - 2⁸ = 55615723 is a prime.

It is a Sophie Germain prime.

Together with 55615981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55615969) 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, 27807989 + 27807990.

It is an arithmetic number, because the mean of its divisors is an integer number (27807990).

Almost surely, 2^55615979 is an apocalyptic number.

55615979 is a deficient number, since it is larger than the sum of its proper divisors (1).

55615979 is an equidigital number, since it uses as much as digits as its factorization.

55615979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 425250, while the sum is 47.

The square root of 55615979 is about 7457.6121513525. The cubic root of 55615979 is about 381.7096992175.

The spelling of 55615979 in words is "fifty-five million, six hundred fifteen thousand, nine hundred seventy-nine".