311320391 has 4 divisors (see below), whose sum is σ = 315967032. Its totient is φ = 306673752.

The previous prime is 311320381. The next prime is 311320417. The reversal of 311320391 is 193023113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311320391 - 2⁶ = 311320327 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 (311320381) 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, 2323220 + ... + 2323353.

It is an arithmetic number, because the mean of its divisors is an integer number (78991758).

Almost surely, 2^311320391 is an apocalyptic number.

311320391 is a deficient number, since it is larger than the sum of its proper divisors (4646641).

311320391 is an equidigital number, since it uses as much as digits as its factorization.

311320391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4646640.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 311320391 is about 17644.2736036370. The cubic root of 311320391 is about 677.7494738088.

The spelling of 311320391 in words is "three hundred eleven million, three hundred twenty thousand, three hundred ninety-one".