55979521 has 16 divisors (see below), whose sum is σ = 65899008. Its totient is φ = 47059200.

The previous prime is 55979519. The next prime is 55979531. The reversal of 55979521 is 12597955.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55979521 - 2¹ = 55979519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55979531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2766 + ... + 10936.

It is an arithmetic number, because the mean of its divisors is an integer number (4118688).

Almost surely, 2^55979521 is an apocalyptic number.

It is an amenable number.

55979521 is a deficient number, since it is larger than the sum of its proper divisors (9919487).

55979521 is a wasteful number, since it uses less digits than its factorization.

55979521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8232.

The product of its digits is 141750, while the sum is 43.

The square root of 55979521 is about 7481.9463376851. The cubic root of 55979521 is about 382.5395940616.

The spelling of 55979521 in words is "fifty-five million, nine hundred seventy-nine thousand, five hundred twenty-one".