55291918 has 12 divisors (see below), whose sum is σ = 91163520. Its totient is φ = 25132580.

The previous prime is 55291897. The next prime is 55291921. The reversal of 55291918 is 81919255.

It is a super-2 number, since 2×55291918² = 6114392392237448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 113998 + ... + 114481.

It is an arithmetic number, because the mean of its divisors is an integer number (7596960).

Almost surely, 2^55291918 is an apocalyptic number.

55291918 is a deficient number, since it is larger than the sum of its proper divisors (35871602).

55291918 is a wasteful number, since it uses less digits than its factorization.

55291918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228503 (or 228492 counting only the distinct ones).

The product of its digits is 32400, while the sum is 40.

The square root of 55291918 is about 7435.8535488537. The cubic root of 55291918 is about 380.9668775728.

It can be divided in two parts, 5529 and 1918, that added together give a palindrome (7447).

The spelling of 55291918 in words is "fifty-five million, two hundred ninety-one thousand, nine hundred eighteen".