55318957 has 4 divisors (see below), whose sum is σ = 55334140. Its totient is φ = 55303776.

The previous prime is 55318951. The next prime is 55318997. The reversal of 55318957 is 75981355.

55318957 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 28579716 + 26739241 = 5346^2 + 5171^2 .

It is a 3-Lehmer number, since φ(55318957) divides (55318957-1)³.

It is a cyclic number.

It is not a de Polignac number, because 55318957 - 2²³ = 46930349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55318951) 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, 1519 + ... + 10627.

It is an arithmetic number, because the mean of its divisors is an integer number (13833535).

It is a Poulet number, since it divides 2^55318956-1.

Almost surely, 2^55318957 is an apocalyptic number.

55318957 is the 6073-rd pentagonal number.

It is an amenable number.

55318957 is a deficient number, since it is larger than the sum of its proper divisors (15183).

55318957 is an equidigital number, since it uses as much as digits as its factorization.

55318957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15182.

The product of its digits is 189000, while the sum is 43.

The square root of 55318957 is about 7437.6714770148. The cubic root of 55318957 is about 381.0289679295.

The spelling of 55318957 in words is "fifty-five million, three hundred eighteen thousand, nine hundred fifty-seven".