311945 has 8 divisors (see below), whose sum is σ = 379080. Its totient is φ = 246400.

The previous prime is 311897. The next prime is 311951. The reversal of 311945 is 549113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 38416 + 273529 = 196^2 + 523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 311945 - 2⁶ = 311881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311945.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 95 + ... + 795.

It is an arithmetic number, because the mean of its divisors is an integer number (47385).

2³¹¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

311945 is a deficient number, since it is larger than the sum of its proper divisors (67135).

311945 is an equidigital number, since it uses as much as digits as its factorization.

311945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795.

The product of its digits is 540, while the sum is 23.

The square root of 311945 is about 558.5203666833. The cubic root of 311945 is about 67.8202432280.

The spelling of 311945 in words is "three hundred eleven thousand, nine hundred forty-five".