311956 has 12 divisors (see below), whose sum is σ = 550368. Its totient is φ = 154712.

The previous prime is 311951. The next prime is 311957. The reversal of 311956 is 659113.

It is a self number, because there is not a number n which added to its sum of digits gives 311956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (45864).

2³¹¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

311956 is a deficient number, since it is larger than the sum of its proper divisors (238412).

311956 is a wasteful number, since it uses less digits than its factorization.

311956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 636 counting only the distinct ones).

The product of its digits is 810, while the sum is 25.

The square root of 311956 is about 558.5302140440. The cubic root of 311956 is about 67.8210403919.

The spelling of 311956 in words is "three hundred eleven thousand, nine hundred fifty-six".