311869 has 2 divisors, whose sum is σ = 311870. Its totient is φ = 311868.

The previous prime is 311867. The next prime is 311881. The reversal of 311869 is 968113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308025 + 3844 = 555^2 + 62^2 .

It is an emirp because it is prime and its reverse (968113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311869 - 2¹ = 311867 is a prime.

It is a super-2 number, since 2×311869² = 194524546322, which contains 22 as substring.

Together with 311867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155934 + 155935.

It is an arithmetic number, because the mean of its divisors is an integer number (155935).

2³¹¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

311869 is a deficient number, since it is larger than the sum of its proper divisors (1).

311869 is an equidigital number, since it uses as much as digits as its factorization.

311869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 311869 is about 558.4523256286. The cubic root of 311869 is about 67.8147350379.

The spelling of 311869 in words is "three hundred eleven thousand, eight hundred sixty-nine".