311431023 has 18 divisors (see below), whose sum is σ = 455420576. Its totient is φ = 205078392.

The previous prime is 311431019. The next prime is 311431027. The reversal of 311431023 is 320134113.

It is an interprime number because it is at equal distance from previous prime (311431019) and next prime (311431027).

It is not a de Polignac number, because 311431023 - 2² = 311431019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311430987 and 311431005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431027) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 59490 + ... + 64512.

Almost surely, 2^311431023 is an apocalyptic number.

311431023 is a deficient number, since it is larger than the sum of its proper divisors (143989553).

311431023 is an equidigital number, since it uses as much as digits as its factorization.

311431023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195 (or 5109 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 311431023 is about 17647.4083933024. The cubic root of 311431023 is about 677.8297468458.

Adding to 311431023 its reverse (320134113), we get a palindrome (631565136).

The spelling of 311431023 in words is "three hundred eleven million, four hundred thirty-one thousand, twenty-three".