311220197 has 8 divisors (see below), whose sum is σ = 319834944. Its totient is φ = 302668128.

The previous prime is 311220167. The next prime is 311220223. The reversal of 311220197 is 791022113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311220197 - 2¹⁴ = 311203813 is a prime.

It is a super-2 number, since 2×311220197² = 193716022041437618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311220127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5513 + ... + 25550.

It is an arithmetic number, because the mean of its divisors is an integer number (39979368).

Almost surely, 2^311220197 is an apocalyptic number.

It is an amenable number.

311220197 is a deficient number, since it is larger than the sum of its proper divisors (8614747).

311220197 is a wasteful number, since it uses less digits than its factorization.

311220197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31339.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 311220197 is about 17641.4340970342. The cubic root of 311220197 is about 677.6767580269.

The spelling of 311220197 in words is "three hundred eleven million, two hundred twenty thousand, one hundred ninety-seven".