55215245 has 4 divisors (see below), whose sum is σ = 66258300. Its totient is φ = 44172192.

The previous prime is 55215239. The next prime is 55215263. The reversal of 55215245 is 54251255.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40934404 + 14280841 = 6398^2 + 3779^2 .

It is a cyclic number.

It is not a de Polignac number, because 55215245 - 2²⁰ = 54166669 is a prime.

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, 5521520 + ... + 5521529.

It is an arithmetic number, because the mean of its divisors is an integer number (16564575).

Almost surely, 2^55215245 is an apocalyptic number.

It is an amenable number.

55215245 is a deficient number, since it is larger than the sum of its proper divisors (11043055).

55215245 is a wasteful number, since it uses less digits than its factorization.

55215245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11043054.

The product of its digits is 10000, while the sum is 29.

The square root of 55215245 is about 7430.6961315882. The cubic root of 55215245 is about 380.7907012190.

The spelling of 55215245 in words is "fifty-five million, two hundred fifteen thousand, two hundred forty-five".