311404969 has 2 divisors, whose sum is σ = 311404970. Its totient is φ = 311404968.

The previous prime is 311404967. The next prime is 311404979. The reversal of 311404969 is 969404113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309936025 + 1468944 = 17605^2 + 1212^2 .

It is an emirp because it is prime and its reverse (969404113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311404969 - 2¹ = 311404967 is a prime.

It is a super-2 number, since 2×311404969² = 193946109435781922, which contains 22 as substring.

Together with 311404967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (311404967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155702484 + 155702485.

It is an arithmetic number, because the mean of its divisors is an integer number (155702485).

Almost surely, 2^311404969 is an apocalyptic number.

It is an amenable number.

311404969 is a deficient number, since it is larger than the sum of its proper divisors (1).

311404969 is an equidigital number, since it uses as much as digits as its factorization.

311404969 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 37.

The square root of 311404969 is about 17646.6701958188. The cubic root of 311404969 is about 677.8108441381.

The spelling of 311404969 in words is "three hundred eleven million, four hundred four thousand, nine hundred sixty-nine".