311897 has 2 divisors, whose sum is σ = 311898. Its totient is φ = 311896.

The previous prime is 311881. The next prime is 311951. The reversal of 311897 is 798113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190096 + 121801 = 436^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 311897 - 2⁴ = 311881 is a prime.

It is not a weakly prime, because it can be changed into another prime (311807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155948 + 155949.

It is an arithmetic number, because the mean of its divisors is an integer number (155949).

2³¹¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

311897 is a deficient number, since it is larger than the sum of its proper divisors (1).

311897 is an equidigital number, since it uses as much as digits as its factorization.

311897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 311897 is about 558.4773943500. The cubic root of 311897 is about 67.8167644752.

The spelling of 311897 in words is "three hundred eleven thousand, eight hundred ninety-seven".