55017979 has 4 divisors (see below), whose sum is σ = 55336176. Its totient is φ = 54699784.

The previous prime is 55017973. The next prime is 55018013. The reversal of 55017979 is 97971055.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55017979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55017973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158839 + ... + 159184.

It is an arithmetic number, because the mean of its divisors is an integer number (13834044).

Almost surely, 2^55017979 is an apocalyptic number.

55017979 is a deficient number, since it is larger than the sum of its proper divisors (318197).

55017979 is a wasteful number, since it uses less digits than its factorization.

55017979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318196.

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 55017979 is about 7417.4105319849. The cubic root of 55017979 is about 380.3366799146.

The spelling of 55017979 in words is "fifty-five million, seventeen thousand, nine hundred seventy-nine".