55313215 has 4 divisors (see below), whose sum is σ = 66375864. Its totient is φ = 44250568.

The previous prime is 55313213. The next prime is 55313227. The reversal of 55313215 is 51231355.

55313215 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.

It is a cyclic number.

It is not a de Polignac number, because 55313215 - 2¹ = 55313213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55313215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55313213) 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, 5531317 + ... + 5531326.

It is an arithmetic number, because the mean of its divisors is an integer number (16593966).

Almost surely, 2^55313215 is an apocalyptic number.

55313215 is a deficient number, since it is larger than the sum of its proper divisors (11062649).

55313215 is a wasteful number, since it uses less digits than its factorization.

55313215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11062648.

The product of its digits is 2250, while the sum is 25.

The square root of 55313215 is about 7437.2854590906. The cubic root of 55313215 is about 381.0157841184.

The spelling of 55313215 in words is "fifty-five million, three hundred thirteen thousand, two hundred fifteen".