311431243 has 2 divisors, whose sum is σ = 311431244. Its totient is φ = 311431242.

The previous prime is 311431231. The next prime is 311431271. The reversal of 311431243 is 342134113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311431243 - 2⁹ = 311430731 is a prime.

It is not a weakly prime, because it can be changed into another prime (311431283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155715621 + 155715622.

It is an arithmetic number, because the mean of its divisors is an integer number (155715622).

Almost surely, 2^311431243 is an apocalyptic number.

311431243 is a deficient number, since it is larger than the sum of its proper divisors (1).

311431243 is an equidigital number, since it uses as much as digits as its factorization.

311431243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 311431243 is about 17647.4146265112. The cubic root of 311431243 is about 677.8299064557.

Adding to 311431243 its reverse (342134113), we get a palindrome (653565356).

The spelling of 311431243 in words is "three hundred eleven million, four hundred thirty-one thousand, two hundred forty-three".