55215593 has 4 divisors (see below), whose sum is σ = 55524240. Its totient is φ = 54906948.

The previous prime is 55215551. The next prime is 55215599. The reversal of 55215593 is 39551255.

55215593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55215593 - 2²⁰ = 54167017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55215599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154055 + ... + 154412.

It is an arithmetic number, because the mean of its divisors is an integer number (13881060).

Almost surely, 2^55215593 is an apocalyptic number.

It is an amenable number.

55215593 is a deficient number, since it is larger than the sum of its proper divisors (308647).

55215593 is a wasteful number, since it uses less digits than its factorization.

55215593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308646.

The product of its digits is 33750, while the sum is 35.

The square root of 55215593 is about 7430.7195479307. The cubic root of 55215593 is about 380.7915012087.

The spelling of 55215593 in words is "fifty-five million, two hundred fifteen thousand, five hundred ninety-three".