55549979 has 2 divisors, whose sum is σ = 55549980. Its totient is φ = 55549978.

The previous prime is 55549961. The next prime is 55550017. The reversal of 55549979 is 97994555.

It is a happy number.

55549979 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 a de Polignac number, because none of the positive numbers 2^k-55549979 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55549979.

It is not a weakly prime, because it can be changed into another prime (55549909) 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, 27774989 + 27774990.

It is an arithmetic number, because the mean of its divisors is an integer number (27774990).

Almost surely, 2^55549979 is an apocalyptic number.

55549979 is a deficient number, since it is larger than the sum of its proper divisors (1).

55549979 is an equidigital number, since it uses as much as digits as its factorization.

55549979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2551500, while the sum is 53.

The square root of 55549979 is about 7453.1858288922. The cubic root of 55549979 is about 381.5586466321.

The spelling of 55549979 in words is "fifty-five million, five hundred forty-nine thousand, nine hundred seventy-nine".