311117971 has 4 divisors (see below), whose sum is σ = 311330944. Its totient is φ = 310905000.

The previous prime is 311117959. The next prime is 311117977. The reversal of 311117971 is 179711113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311117971 - 2⁷ = 311117843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311117977) 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, 104280 + ... + 107221.

It is an arithmetic number, because the mean of its divisors is an integer number (77832736).

Almost surely, 2^311117971 is an apocalyptic number.

311117971 is a deficient number, since it is larger than the sum of its proper divisors (212973).

311117971 is a wasteful number, since it uses less digits than its factorization.

311117971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212972.

The product of its digits is 1323, while the sum is 31.

The square root of 311117971 is about 17638.5365322637. The cubic root of 311117971 is about 677.6025514348.

The spelling of 311117971 in words is "three hundred eleven million, one hundred seventeen thousand, nine hundred seventy-one".