311921663 has 2 divisors, whose sum is σ = 311921664. Its totient is φ = 311921662.

The previous prime is 311921573. The next prime is 311921669. The reversal of 311921663 is 366129113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311921663 - 2²⁸ = 43486207 is a prime.

It is equal to p_16862603 and since 311921663 and 16862603 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311921669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155960831 + 155960832.

It is an arithmetic number, because the mean of its divisors is an integer number (155960832).

Almost surely, 2^311921663 is an apocalyptic number.

311921663 is a deficient number, since it is larger than the sum of its proper divisors (1).

311921663 is an equidigital number, since it uses as much as digits as its factorization.

311921663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 311921663 is about 17661.3041137964. The cubic root of 311921663 is about 678.1855194644.

The spelling of 311921663 in words is "three hundred eleven million, nine hundred twenty-one thousand, six hundred sixty-three".