55321918 has 16 divisors (see below), whose sum is σ = 86501376. Its totient is φ = 26505720.

The previous prime is 55321909. The next prime is 55321991. The reversal of 55321918 is 81912355.

55321918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55321918² = 6121029222397448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2055 + ... + 10717.

It is an arithmetic number, because the mean of its divisors is an integer number (5406336).

Almost surely, 2^55321918 is an apocalyptic number.

55321918 is a deficient number, since it is larger than the sum of its proper divisors (31179458).

55321918 is a wasteful number, since it uses less digits than its factorization.

55321918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8799.

The product of its digits is 10800, while the sum is 34.

The square root of 55321918 is about 7437.8705285854. The cubic root of 55321918 is about 381.0357661213.

The spelling of 55321918 in words is "fifty-five million, three hundred twenty-one thousand, nine hundred eighteen".