311231023 has 2 divisors, whose sum is σ = 311231024. Its totient is φ = 311231022.

The previous prime is 311231021. The next prime is 311231029. The reversal of 311231023 is 320132113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311231023 - 2¹ = 311231021 is a prime.

Together with 311231021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 311230988 and 311231006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311231021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155615511 + 155615512.

It is an arithmetic number, because the mean of its divisors is an integer number (155615512).

Almost surely, 2^311231023 is an apocalyptic number.

311231023 is a deficient number, since it is larger than the sum of its proper divisors (1).

311231023 is an equidigital number, since it uses as much as digits as its factorization.

311231023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 311231023 is about 17641.7409288313. The cubic root of 311231023 is about 677.6846157469.

Adding to 311231023 its reverse (320132113), we get a palindrome (631363136).

The spelling of 311231023 in words is "three hundred eleven million, two hundred thirty-one thousand, twenty-three".