53218317 has 4 divisors (see below), whose sum is σ = 70957760. Its totient is φ = 35478876.

The previous prime is 53218283. The next prime is 53218331. The reversal of 53218317 is 71381235.

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 not a de Polignac number, because 53218317 - 2¹¹ = 53216269 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 (53218717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8869717 + ... + 8869722.

It is an arithmetic number, because the mean of its divisors is an integer number (17739440).

Almost surely, 2^53218317 is an apocalyptic number.

It is an amenable number.

53218317 is a deficient number, since it is larger than the sum of its proper divisors (17739443).

53218317 is a wasteful number, since it uses less digits than its factorization.

53218317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17739442.

The product of its digits is 5040, while the sum is 30.

The square root of 53218317 is about 7295.0885532665. The cubic root of 53218317 is about 376.1436305236.

It can be divided in two parts, 53218 and 317, that added together give a palindrome (53535).

The spelling of 53218317 in words is "fifty-three million, two hundred eighteen thousand, three hundred seventeen".