55213918 has 8 divisors (see below), whose sum is σ = 82852560. Its totient is φ = 27596400.

The previous prime is 55213913. The next prime is 55213933. The reversal of 55213918 is 81931255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55213913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6618 + ... + 12418.

It is an arithmetic number, because the mean of its divisors is an integer number (10356570).

Almost surely, 2^55213918 is an apocalyptic number.

55213918 is a deficient number, since it is larger than the sum of its proper divisors (27638642).

55213918 is a wasteful number, since it uses less digits than its factorization.

55213918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10562.

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

The square root of 55213918 is about 7430.6068392830. The cubic root of 55213918 is about 380.7876506526.

The spelling of 55213918 in words is "fifty-five million, two hundred thirteen thousand, nine hundred eighteen".