311889213 has 12 divisors (see below), whose sum is σ = 451082268. Its totient is φ = 207660480.

The previous prime is 311889211. The next prime is 311889217. The reversal of 311889213 is 312988113.

It can be written as a sum of positive squares in 2 ways, for example, as 186404409 + 125484804 = 13653^2 + 11202^2 .

It is not a de Polignac number, because 311889213 - 2¹ = 311889211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311889211) 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, 14568 + ... + 28913.

It is an arithmetic number, because the mean of its divisors is an integer number (37590189).

Almost surely, 2^311889213 is an apocalyptic number.

It is an amenable number.

311889213 is a deficient number, since it is larger than the sum of its proper divisors (139193055).

311889213 is a wasteful number, since it uses less digits than its factorization.

311889213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44284 (or 44281 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 311889213 is about 17660.3854148204. The cubic root of 311889213 is about 678.1620008636.

It can be divided in two parts, 31188 and 9213, that added together give a square (40401 = 201²).

The spelling of 311889213 in words is "three hundred eleven million, eight hundred eighty-nine thousand, two hundred thirteen".