313121216 has 28 divisors (see below), whose sum is σ = 654055080. Its totient is φ = 148320000.

The previous prime is 313121209. The next prime is 313121219. The reversal of 313121216 is 612121313.

313121216 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313121219) 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, 127535 + ... + 129966.

It is an arithmetic number, because the mean of its divisors is an integer number (23359110).

Almost surely, 2^313121216 is an apocalyptic number.

It is an amenable number.

313121216 is an abundant number, since it is smaller than the sum of its proper divisors (340933864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

313121216 is a wasteful number, since it uses less digits than its factorization.

313121216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257532 (or 257522 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 313121216 is about 17695.2314480484. The cubic root of 313121216 is about 679.0537704241.

Adding to 313121216 its reverse (612121313), we get a palindrome (925242529).

The spelling of 313121216 in words is "three hundred thirteen million, one hundred twenty-one thousand, two hundred sixteen".