311043431 has 2 divisors, whose sum is σ = 311043432. Its totient is φ = 311043430.

The previous prime is 311043409. The next prime is 311043449. The reversal of 311043431 is 134340113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311043431 - 2¹⁴ = 311027047 is a prime.

It is a super-2 number, since 2×311043431² = 193496031936503522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311043451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155521715 + 155521716.

It is an arithmetic number, because the mean of its divisors is an integer number (155521716).

Almost surely, 2^311043431 is an apocalyptic number.

311043431 is a deficient number, since it is larger than the sum of its proper divisors (1).

311043431 is an equidigital number, since it uses as much as digits as its factorization.

311043431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 311043431 is about 17636.4234185960. The cubic root of 311043431 is about 677.5484320619.

Adding to 311043431 its reverse (134340113), we get a palindrome (445383544).

The spelling of 311043431 in words is "three hundred eleven million, forty-three thousand, four hundred thirty-one".