55181918 has 8 divisors (see below), whose sum is σ = 90297720. Its totient is φ = 25082680.

The previous prime is 55181897. The next prime is 55181921. The reversal of 55181918 is 81918155.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1254113 + ... + 1254156.

It is an arithmetic number, because the mean of its divisors is an integer number (11287215).

Almost surely, 2^55181918 is an apocalyptic number.

55181918 is a deficient number, since it is larger than the sum of its proper divisors (35115802).

55181918 is a wasteful number, since it uses less digits than its factorization.

55181918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2508282.

The product of its digits is 14400, while the sum is 38.

The square root of 55181918 is about 7428.4532710383. The cubic root of 55181918 is about 380.7140728298.

The spelling of 55181918 in words is "fifty-five million, one hundred eighty-one thousand, nine hundred eighteen".