311542393 has 2 divisors, whose sum is σ = 311542394. Its totient is φ = 311542392.

The previous prime is 311542333. The next prime is 311542397. The reversal of 311542393 is 393245113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176703849 + 134838544 = 13293^2 + 11612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311542393 is a prime.

It is not a weakly prime, because it can be changed into another prime (311542397) 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, 155771196 + 155771197.

It is an arithmetic number, because the mean of its divisors is an integer number (155771197).

Almost surely, 2^311542393 is an apocalyptic number.

It is an amenable number.

311542393 is a deficient number, since it is larger than the sum of its proper divisors (1).

311542393 is an equidigital number, since it uses as much as digits as its factorization.

311542393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 311542393 is about 17650.5635320802. The cubic root of 311542393 is about 677.9105361662.

The spelling of 311542393 in words is "three hundred eleven million, five hundred forty-two thousand, three hundred ninety-three".