311249 has 4 divisors (see below), whose sum is σ = 312420. Its totient is φ = 310080.

The previous prime is 311237. The next prime is 311279. The reversal of 311249 is 942113.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 117649 + 193600 = 343^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311249.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311279) 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, 29 + ... + 789.

It is an arithmetic number, because the mean of its divisors is an integer number (78105).

2³¹¹²⁴⁹ is an apocalyptic number.

It is an amenable number.

311249 is a deficient number, since it is larger than the sum of its proper divisors (1171).

311249 is an equidigital number, since it uses as much as digits as its factorization.

311249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 216, while the sum is 20.

The square root of 311249 is about 557.8969438884. The cubic root of 311249 is about 67.7697663398.

The spelling of 311249 in words is "three hundred eleven thousand, two hundred forty-nine".