311249389 has 12 divisors (see below), whose sum is σ = 347733820. Its totient is φ = 278308800.

The previous prime is 311249357. The next prime is 311249459. The reversal of 311249389 is 983942113.

It can be written as a sum of positive squares in 2 ways, for example, as 165636900 + 145612489 = 12870^2 + 12067^2 .

It is not a de Polignac number, because 311249389 - 2⁵ = 311249357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311249189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13704 + ... + 28465.

Almost surely, 2^311249389 is an apocalyptic number.

It is an amenable number.

311249389 is a deficient number, since it is larger than the sum of its proper divisors (36484431).

311249389 is a wasteful number, since it uses less digits than its factorization.

311249389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42252 (or 42241 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 311249389 is about 17642.2614480117. The cubic root of 311249389 is about 677.6979457279.

The spelling of 311249389 in words is "three hundred eleven million, two hundred forty-nine thousand, three hundred eighty-nine".