312131023 has 4 divisors (see below), whose sum is σ = 319389928. Its totient is φ = 304872120.

The previous prime is 312131021. The next prime is 312131041. The reversal of 312131023 is 320131213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320131213 = 17483 ⋅18311.

It is a cyclic number.

It is not a de Polignac number, because 312131023 - 2¹ = 312131021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312130988 and 312131006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312131021) 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, 3629388 + ... + 3629473.

It is an arithmetic number, because the mean of its divisors is an integer number (79847482).

Almost surely, 2^312131023 is an apocalyptic number.

312131023 is a deficient number, since it is larger than the sum of its proper divisors (7258905).

312131023 is an equidigital number, since it uses as much as digits as its factorization.

312131023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7258904.

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

The square root of 312131023 is about 17667.2302017039. The cubic root of 312131023 is about 678.3372169177.

Adding to 312131023 its reverse (320131213), we get a palindrome (632262236).

The spelling of 312131023 in words is "three hundred twelve million, one hundred thirty-one thousand, twenty-three".