311661479 has 2 divisors, whose sum is σ = 311661480. Its totient is φ = 311661478.

The previous prime is 311661451. The next prime is 311661481. The reversal of 311661479 is 974166113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311661479 - 2⁸ = 311661223 is a prime.

Together with 311661481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311661439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155830739 + 155830740.

It is an arithmetic number, because the mean of its divisors is an integer number (155830740).

Almost surely, 2^311661479 is an apocalyptic number.

311661479 is a deficient number, since it is larger than the sum of its proper divisors (1).

311661479 is an equidigital number, since it uses as much as digits as its factorization.

311661479 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 311661479 is about 17653.9366431400. The cubic root of 311661479 is about 677.9969014805.

The spelling of 311661479 in words is "three hundred eleven million, six hundred sixty-one thousand, four hundred seventy-nine".