311423989 has 2 divisors, whose sum is σ = 311423990. Its totient is φ = 311423988.

The previous prime is 311423977. The next prime is 311423999. The reversal of 311423989 is 989324113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168143089 + 143280900 = 12967^2 + 11970^2 .

It is a cyclic number.

It is not a de Polignac number, because 311423989 - 2⁹ = 311423477 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 (311423909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155711994 + 155711995.

It is an arithmetic number, because the mean of its divisors is an integer number (155711995).

Almost surely, 2^311423989 is an apocalyptic number.

It is an amenable number.

311423989 is a deficient number, since it is larger than the sum of its proper divisors (1).

311423989 is an equidigital number, since it uses as much as digits as its factorization.

311423989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 311423989 is about 17647.2090994582. The cubic root of 311423989 is about 677.8246436394.

The spelling of 311423989 in words is "three hundred eleven million, four hundred twenty-three thousand, nine hundred eighty-nine".