311123243 has 2 divisors, whose sum is σ = 311123244. Its totient is φ = 311123242.

The previous prime is 311123237. The next prime is 311123261. The reversal of 311123243 is 342321113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311123243 - 2⁴ = 311123227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311123213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155561621 + 155561622.

It is an arithmetic number, because the mean of its divisors is an integer number (155561622).

Almost surely, 2^311123243 is an apocalyptic number.

311123243 is a deficient number, since it is larger than the sum of its proper divisors (1).

311123243 is an equidigital number, since it uses as much as digits as its factorization.

311123243 is an odious number, because the sum of its binary digits is odd.

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

The square root of 311123243 is about 17638.6859771356. The cubic root of 311123243 is about 677.6063788152.

Adding to 311123243 its reverse (342321113), we get a palindrome (653444356).

The spelling of 311123243 in words is "three hundred eleven million, one hundred twenty-three thousand, two hundred forty-three".