55455215 has 4 divisors (see below), whose sum is σ = 66546264. Its totient is φ = 44364168.

The previous prime is 55455199. The next prime is 55455223. The reversal of 55455215 is 51255455.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55455215 - 2⁴ = 55455199 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5545517 + ... + 5545526.

It is an arithmetic number, because the mean of its divisors is an integer number (16636566).

Almost surely, 2^55455215 is an apocalyptic number.

55455215 is a deficient number, since it is larger than the sum of its proper divisors (11091049).

55455215 is a wasteful number, since it uses less digits than its factorization.

55455215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11091048.

The product of its digits is 25000, while the sum is 32.

The square root of 55455215 is about 7446.8258338704. The cubic root of 55455215 is about 381.3415532165.

The spelling of 55455215 in words is "fifty-five million, four hundred fifty-five thousand, two hundred fifteen".