311326681 has 2 divisors, whose sum is σ = 311326682. Its totient is φ = 311326680.

The previous prime is 311326663. The next prime is 311326711. The reversal of 311326681 is 186623113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245862400 + 65464281 = 15680^2 + 8091^2 .

It is a cyclic number.

It is not a de Polignac number, because 311326681 - 2¹³ = 311318489 is a prime.

It is a super-2 number, since 2×311326681² = 193848604604951522, which contains 22 as substring.

It is equal to p_16832218 and since 311326681 and 16832218 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (311326601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155663340 + 155663341.

It is an arithmetic number, because the mean of its divisors is an integer number (155663341).

Almost surely, 2^311326681 is an apocalyptic number.

It is an amenable number.

311326681 is a deficient number, since it is larger than the sum of its proper divisors (1).

311326681 is an equidigital number, since it uses as much as digits as its factorization.

311326681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 311326681 is about 17644.4518475355. The cubic root of 311326681 is about 677.7540382550.

Adding to 311326681 its reverse (186623113), we get a palindrome (497949794).

The spelling of 311326681 in words is "three hundred eleven million, three hundred twenty-six thousand, six hundred eighty-one".