311687 has 2 divisors, whose sum is σ = 311688. Its totient is φ = 311686.

The previous prime is 311683. The next prime is 311711. The reversal of 311687 is 786113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311687 - 2² = 311683 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 311687.

It is not a weakly prime, because it can be changed into another prime (311681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155843 + 155844.

It is an arithmetic number, because the mean of its divisors is an integer number (155844).

2³¹¹⁶⁸⁷ is an apocalyptic number.

311687 is a deficient number, since it is larger than the sum of its proper divisors (1).

311687 is an equidigital number, since it uses as much as digits as its factorization.

311687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 311687 is about 558.2893515015. The cubic root of 311687 is about 67.8015407336.

The spelling of 311687 in words is "three hundred eleven thousand, six hundred eighty-seven".