311197 has 2 divisors, whose sum is σ = 311198. Its totient is φ = 311196.

The previous prime is 311189. The next prime is 311203. The reversal of 311197 is 791113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177241 + 133956 = 421^2 + 366^2 .

It is a cyclic number.

It is not a de Polignac number, because 311197 - 2³ = 311189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155598 + 155599.

It is an arithmetic number, because the mean of its divisors is an integer number (155599).

2³¹¹¹⁹⁷ is an apocalyptic number.

It is an amenable number.

311197 is a deficient number, since it is larger than the sum of its proper divisors (1).

311197 is an equidigital number, since it uses as much as digits as its factorization.

311197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189, while the sum is 22.

The square root of 311197 is about 557.8503383525. The cubic root of 311197 is about 67.7659920582.

The spelling of 311197 in words is "three hundred eleven thousand, one hundred ninety-seven".