312311220311 has 4 divisors (see below), whose sum is σ = 312937095000. Its totient is φ = 311685345624.

The previous prime is 312311220271. The next prime is 312311220323. The reversal of 312311220311 is 113022113213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113022113213 = 131 ⋅862764223.

It is a cyclic number.

It is not a de Polignac number, because 312311220311 - 2³⁸ = 37433313367 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 (312311220211) 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, 312936596 + ... + 312937593.

It is an arithmetic number, because the mean of its divisors is an integer number (78234273750).

Almost surely, 2^312311220311 is an apocalyptic number.

312311220311 is a deficient number, since it is larger than the sum of its proper divisors (625874689).

312311220311 is an equidigital number, since it uses as much as digits as its factorization.

312311220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625874688.

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

Adding to 312311220311 its reverse (113022113213), we get a palindrome (425333333524).

The spelling of 312311220311 in words is "three hundred twelve billion, three hundred eleven million, two hundred twenty thousand, three hundred eleven".