312131431 has 2 divisors, whose sum is σ = 312131432. Its totient is φ = 312131430.

The previous prime is 312131399. The next prime is 312131461. The reversal of 312131431 is 134131213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 312131431 - 2⁵ = 312131399 is a prime.

It is a super-2 number, since 2×312131431² = 194852060436215522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312131399 and 312131408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312131461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156065715 + 156065716.

It is an arithmetic number, because the mean of its divisors is an integer number (156065716).

Almost surely, 2^312131431 is an apocalyptic number.

312131431 is a deficient number, since it is larger than the sum of its proper divisors (1).

312131431 is an equidigital number, since it uses as much as digits as its factorization.

312131431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 312131431 is about 17667.2417485017. The cubic root of 312131431 is about 678.3375124789.

Adding to 312131431 its reverse (134131213), we get a palindrome (446262644).

The spelling of 312131431 in words is "three hundred twelve million, one hundred thirty-one thousand, four hundred thirty-one".