311797 has 4 divisors (see below), whose sum is σ = 330156. Its totient is φ = 293440.

The previous prime is 311791. The next prime is 311803. The reversal of 311797 is 797113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797113 = 17 ⋅46889.

It is an interprime number because it is at equal distance from previous prime (311791) and next prime (311803).

It can be written as a sum of positive squares in 2 ways, for example, as 130321 + 181476 = 361^2 + 426^2 .

It is a cyclic number.

It is not a de Polignac number, because 311797 - 2¹⁵ = 279029 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311791) 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, 9154 + ... + 9187.

It is an arithmetic number, because the mean of its divisors is an integer number (82539).

2³¹¹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

311797 is a deficient number, since it is larger than the sum of its proper divisors (18359).

311797 is a wasteful number, since it uses less digits than its factorization.

311797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18358.

The product of its digits is 1323, while the sum is 28.

The square root of 311797 is about 558.3878580342. The cubic root of 311797 is about 67.8095159269.

The spelling of 311797 in words is "three hundred eleven thousand, seven hundred ninety-seven".