311297197 has 4 divisors (see below), whose sum is σ = 327681280. Its totient is φ = 294913116.

The previous prime is 311297179. The next prime is 311297201. The reversal of 311297197 is 791792113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 791792113 = 7 ⋅113113159.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311297197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311297137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8192013 + ... + 8192050.

It is an arithmetic number, because the mean of its divisors is an integer number (81920320).

Almost surely, 2^311297197 is an apocalyptic number.

It is an amenable number.

311297197 is a deficient number, since it is larger than the sum of its proper divisors (16384083).

311297197 is a wasteful number, since it uses less digits than its factorization.

311297197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16384082.

The product of its digits is 23814, while the sum is 40.

The square root of 311297197 is about 17643.6163243254. The cubic root of 311297197 is about 677.7326421544.

The spelling of 311297197 in words is "three hundred eleven million, two hundred ninety-seven thousand, one hundred ninety-seven".