311023197 has 6 divisors (see below), whose sum is σ = 449255742. Its totient is φ = 207348792.

The previous prime is 311023189. The next prime is 311023249. The reversal of 311023197 is 791320113.

It can be written as a sum of positive squares in only one way, i.e., 266146596 + 44876601 = 16314^2 + 6699^2 .

It is not a de Polignac number, because 311023197 - 2³ = 311023189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311023197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311023997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17279058 + ... + 17279075.

It is an arithmetic number, because the mean of its divisors is an integer number (74875957).

Almost surely, 2^311023197 is an apocalyptic number.

It is an amenable number.

311023197 is a deficient number, since it is larger than the sum of its proper divisors (138232545).

311023197 is a wasteful number, since it uses less digits than its factorization.

311023197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34558139 (or 34558136 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 311023197 is about 17635.8497668811. The cubic root of 311023197 is about 677.5337397811.

The spelling of 311023197 in words is "three hundred eleven million, twenty-three thousand, one hundred ninety-seven".