311231380 has 24 divisors (see below), whose sum is σ = 659374632. Its totient is φ = 123389952.

The previous prime is 311231353. The next prime is 311231429. The reversal of 311231380 is 83132113.

311231380 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12702096 + 298529284 = 3564^2 + 17278^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66597 + ... + 71116.

It is an arithmetic number, because the mean of its divisors is an integer number (27473943).

Almost surely, 2^311231380 is an apocalyptic number.

It is an amenable number.

311231380 is an abundant number, since it is smaller than the sum of its proper divisors (348143252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311231380 is a wasteful number, since it uses less digits than its factorization.

311231380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137835 (or 137833 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 311231380 is about 17641.7510468774. The cubic root of 311231380 is about 677.6848748613.

Adding to 311231380 its reverse (83132113), we get a palindrome (394363493).

The spelling of 311231380 in words is "three hundred eleven million, two hundred thirty-one thousand, three hundred eighty".