311299243 has 2 divisors, whose sum is σ = 311299244. Its totient is φ = 311299242.

The previous prime is 311299187. The next prime is 311299277. The reversal of 311299243 is 342992113.

It is an a-pointer prime, because the next prime (311299277) can be obtained adding 311299243 to its sum of digits (34).

It is a strong prime.

It is an emirp because it is prime and its reverse (342992113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311299243 - 2²⁵ = 277744811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311299199 and 311299208.

It is not a weakly prime, because it can be changed into another prime (311299843) 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, 155649621 + 155649622.

It is an arithmetic number, because the mean of its divisors is an integer number (155649622).

Almost surely, 2^311299243 is an apocalyptic number.

311299243 is a deficient number, since it is larger than the sum of its proper divisors (1).

311299243 is an equidigital number, since it uses as much as digits as its factorization.

311299243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 311299243 is about 17643.6743055408. The cubic root of 311299243 is about 677.7341269498.

The spelling of 311299243 in words is "three hundred eleven million, two hundred ninety-nine thousand, two hundred forty-three".