311042309 has 2 divisors, whose sum is σ = 311042310. Its totient is φ = 311042308.

The previous prime is 311042243. The next prime is 311042321. The reversal of 311042309 is 903240113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253510084 + 57532225 = 15922^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 311042309 - 2²⁴ = 294265093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311042209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155521154 + 155521155.

It is an arithmetic number, because the mean of its divisors is an integer number (155521155).

Almost surely, 2^311042309 is an apocalyptic number.

It is an amenable number.

311042309 is a deficient number, since it is larger than the sum of its proper divisors (1).

311042309 is an equidigital number, since it uses as much as digits as its factorization.

311042309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 311042309 is about 17636.3916093967. The cubic root of 311042309 is about 677.5476173737.

The spelling of 311042309 in words is "three hundred eleven million, forty-two thousand, three hundred nine".