311979539 has 2 divisors, whose sum is σ = 311979540. Its totient is φ = 311979538.

The previous prime is 311979533. The next prime is 311979541. The reversal of 311979539 is 935979113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311979539 is a prime.

Together with 311979541, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 311979493 and 311979502.

It is not a weakly prime, because it can be changed into another prime (311979533) 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, 155989769 + 155989770.

It is an arithmetic number, because the mean of its divisors is an integer number (155989770).

Almost surely, 2^311979539 is an apocalyptic number.

311979539 is a deficient number, since it is larger than the sum of its proper divisors (1).

311979539 is an equidigital number, since it uses as much as digits as its factorization.

311979539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 229635, while the sum is 47.

The square root of 311979539 is about 17662.9425351497. The cubic root of 311979539 is about 678.2274618733.

The spelling of 311979539 in words is "three hundred eleven million, nine hundred seventy-nine thousand, five hundred thirty-nine".