311042243 has 2 divisors, whose sum is σ = 311042244. Its totient is φ = 311042242.

The previous prime is 311042231. The next prime is 311042309. The reversal of 311042243 is 342240113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311042243 - 2⁸ = 311041987 is a prime.

It is not a weakly prime, because it can be changed into another prime (311042203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155521121 + 155521122.

It is an arithmetic number, because the mean of its divisors is an integer number (155521122).

Almost surely, 2^311042243 is an apocalyptic number.

311042243 is a deficient number, since it is larger than the sum of its proper divisors (1).

311042243 is an equidigital number, since it uses as much as digits as its factorization.

311042243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 311042243 is about 17636.3897382656. The cubic root of 311042243 is about 677.5475694508.

Adding to 311042243 its reverse (342240113), we get a palindrome (653282356).

The spelling of 311042243 in words is "three hundred eleven million, forty-two thousand, two hundred forty-three".