312111331 has 6 divisors (see below), whose sum is σ = 363068340. Its totient is φ = 267523956.

The previous prime is 312111323. The next prime is 312111367. The reversal of 312111331 is 133111213.

It is not a de Polignac number, because 312111331 - 2³ = 312111323 is a prime.

It is a super-2 number, since 2×312111331² = 194826965877183122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312111731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3184761 + ... + 3184858.

It is an arithmetic number, because the mean of its divisors is an integer number (60511390).

Almost surely, 2^312111331 is an apocalyptic number.

312111331 is a deficient number, since it is larger than the sum of its proper divisors (50957009).

312111331 is an equidigital number, since it uses as much as digits as its factorization.

312111331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369633 (or 6369626 counting only the distinct ones).

The product of its digits is 54, while the sum is 16.

The square root of 312111331 is about 17666.6728899360. The cubic root of 312111331 is about 678.3229514369.

Adding to 312111331 its reverse (133111213), we get a palindrome (445222544).

The spelling of 312111331 in words is "three hundred twelve million, one hundred eleven thousand, three hundred thirty-one".