311442997 has 2 divisors, whose sum is σ = 311442998. Its totient is φ = 311442996.

The previous prime is 311442973. The next prime is 311443021. The reversal of 311442997 is 799244113.

It is a balanced prime because it is at equal distance from previous prime (311442973) and next prime (311443021).

It can be written as a sum of positive squares in only one way, i.e., 263542756 + 47900241 = 16234^2 + 6921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311442997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311442917) 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, 155721498 + 155721499.

It is an arithmetic number, because the mean of its divisors is an integer number (155721499).

Almost surely, 2^311442997 is an apocalyptic number.

It is an amenable number.

311442997 is a deficient number, since it is larger than the sum of its proper divisors (1).

311442997 is an equidigital number, since it uses as much as digits as its factorization.

311442997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 311442997 is about 17647.7476466545. The cubic root of 311442997 is about 677.8384338730.

The spelling of 311442997 in words is "three hundred eleven million, four hundred forty-two thousand, nine hundred ninety-seven".