311279249 has 2 divisors, whose sum is σ = 311279250. Its totient is φ = 311279248.

The previous prime is 311279219. The next prime is 311279251. The reversal of 311279249 is 942972113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268140625 + 43138624 = 16375^2 + 6568^2 .

It is an emirp because it is prime and its reverse (942972113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311279249 - 2²⁸ = 42843793 is a prime.

It is a Sophie Germain prime.

Together with 311279251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (311279219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155639624 + 155639625.

It is an arithmetic number, because the mean of its divisors is an integer number (155639625).

Almost surely, 2^311279249 is an apocalyptic number.

It is an amenable number.

311279249 is a deficient number, since it is larger than the sum of its proper divisors (1).

311279249 is an equidigital number, since it uses as much as digits as its factorization.

311279249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 311279249 is about 17643.1076911070. The cubic root of 311279249 is about 677.7196168961.

The spelling of 311279249 in words is "three hundred eleven million, two hundred seventy-nine thousand, two hundred forty-nine".