311441993 has 2 divisors, whose sum is σ = 311441994. Its totient is φ = 311441992.

The previous prime is 311441971. The next prime is 311442031. The reversal of 311441993 is 399144113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212080969 + 99361024 = 14563^2 + 9968^2 .

It is a cyclic number.

It is not a de Polignac number, because 311441993 - 2¹² = 311437897 is a prime.

It is a super-2 number, since 2×311441993² = 193992230007624098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311441093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155720996 + 155720997.

It is an arithmetic number, because the mean of its divisors is an integer number (155720997).

Almost surely, 2^311441993 is an apocalyptic number.

It is an amenable number.

311441993 is a deficient number, since it is larger than the sum of its proper divisors (1).

311441993 is an equidigital number, since it uses as much as digits as its factorization.

311441993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 35.

The square root of 311441993 is about 17647.7192010752. The cubic root of 311441993 is about 677.8377054888.

The spelling of 311441993 in words is "three hundred eleven million, four hundred forty-one thousand, nine hundred ninety-three".