13555979 has 4 divisors (see below), whose sum is σ = 13608984. Its totient is φ = 13502976.

The previous prime is 13555967. The next prime is 13555981. The reversal of 13555979 is 97955531.

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

It is a cyclic number.

It is not a de Polignac number, because 13555979 - 2²⁰ = 12507403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13555999) 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 in 3 ways as a sum of consecutive naturals, for example, 26117 + ... + 26630.

It is an arithmetic number, because the mean of its divisors is an integer number (3402246).

Almost surely, 2^13555979 is an apocalyptic number.

13555979 is a deficient number, since it is larger than the sum of its proper divisors (53005).

13555979 is an equidigital number, since it uses as much as digits as its factorization.

13555979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53004.

The product of its digits is 212625, while the sum is 44.

The square root of 13555979 is about 3681.8445105680. The cubic root of 13555979 is about 238.4388192101.

The spelling of 13555979 in words is "thirteen million, five hundred fifty-five thousand, nine hundred seventy-nine".