311309489 has 2 divisors, whose sum is σ = 311309490. Its totient is φ = 311309488.

The previous prime is 311309477. The next prime is 311309501. The reversal of 311309489 is 984903113.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (311309477) and next prime (311309501).

It can be written as a sum of positive squares in only one way, i.e., 244609600 + 66699889 = 15640^2 + 8167^2 .

It is an emirp because it is prime and its reverse (984903113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311309489 - 2⁴ = 311309473 is a prime.

It is a super-2 number, since 2×311309489² = 193827195882882242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (311309459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155654744 + 155654745.

It is an arithmetic number, because the mean of its divisors is an integer number (155654745).

Almost surely, 2^311309489 is an apocalyptic number.

It is an amenable number.

311309489 is a deficient number, since it is larger than the sum of its proper divisors (1).

311309489 is an equidigital number, since it uses as much as digits as its factorization.

311309489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 311309489 is about 17643.9646621727. The cubic root of 311309489 is about 677.7415624403.

The spelling of 311309489 in words is "three hundred eleven million, three hundred nine thousand, four hundred eighty-nine".