318811213 has 4 divisors (see below), whose sum is σ = 364355680. Its totient is φ = 273266748.

The previous prime is 318811201. The next prime is 318811243. The reversal of 318811213 is 312118813.

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 a de Polignac number, because none of the positive numbers 2^k-318811213 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 (318811243) by changing a digit.

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, 22772223 + ... + 22772236.

It is an arithmetic number, because the mean of its divisors is an integer number (91088920).

Almost surely, 2^318811213 is an apocalyptic number.

It is an amenable number.

318811213 is a deficient number, since it is larger than the sum of its proper divisors (45544467).

318811213 is an equidigital number, since it uses as much as digits as its factorization.

318811213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45544466.

The product of its digits is 1152, while the sum is 28.

The square root of 318811213 is about 17855.2852959565. The cubic root of 318811213 is about 683.1423288220.

The spelling of 318811213 in words is "three hundred eighteen million, eight hundred eleven thousand, two hundred thirteen".