311979213 has 48 divisors (see below), whose sum is σ = 558195456. Its totient is φ = 163503360.

The previous prime is 311979191. The next prime is 311979271. The reversal of 311979213 is 312979113.

It is a happy number.

It is not a de Polignac number, because 311979213 - 2⁶ = 311979149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311979293) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135633 + ... + 137913.

It is an arithmetic number, because the mean of its divisors is an integer number (11629072).

Almost surely, 2^311979213 is an apocalyptic number.

It is an amenable number.

311979213 is a deficient number, since it is larger than the sum of its proper divisors (246216243).

311979213 is a wasteful number, since it uses less digits than its factorization.

311979213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474 (or 2471 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 311979213 is about 17662.9333067868. The cubic root of 311979213 is about 678.2272256375.

The spelling of 311979213 in words is "three hundred eleven million, nine hundred seventy-nine thousand, two hundred thirteen".