55213945 has 8 divisors (see below), whose sum is σ = 68394240. Its totient is φ = 42746160.

The previous prime is 55213937. The next prime is 55213993. The reversal of 55213945 is 54931255.

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

It is not a de Polignac number, because 55213945 - 2³ = 55213937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55213945.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 177955 + ... + 178264.

It is an arithmetic number, because the mean of its divisors is an integer number (8549280).

Almost surely, 2^55213945 is an apocalyptic number.

It is an amenable number.

55213945 is a deficient number, since it is larger than the sum of its proper divisors (13180295).

55213945 is a wasteful number, since it uses less digits than its factorization.

55213945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356255.

The product of its digits is 27000, while the sum is 34.

The square root of 55213945 is about 7430.6086560927. The cubic root of 55213945 is about 380.7877127219.

The spelling of 55213945 in words is "fifty-five million, two hundred thirteen thousand, nine hundred forty-five".