311023997 has 2 divisors, whose sum is σ = 311023998. Its totient is φ = 311023996.

The previous prime is 311023931. The next prime is 311024017. The reversal of 311023997 is 799320113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267845956 + 43178041 = 16366^2 + 6571^2 .

It is an emirp because it is prime and its reverse (799320113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311023997 - 2¹² = 311019901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311025997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155511998 + 155511999.

It is an arithmetic number, because the mean of its divisors is an integer number (155511999).

Almost surely, 2^311023997 is an apocalyptic number.

It is an amenable number.

311023997 is a deficient number, since it is larger than the sum of its proper divisors (1).

311023997 is an equidigital number, since it uses as much as digits as its factorization.

311023997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 311023997 is about 17635.8724479397. The cubic root of 311023997 is about 677.5343206880.

The spelling of 311023997 in words is "three hundred eleven million, twenty-three thousand, nine hundred ninety-seven".