311230224 has 60 divisors (see below), whose sum is σ = 875897932. Its totient is φ = 103161600.

The previous prime is 311230159. The next prime is 311230247. The reversal of 311230224 is 422032113.

It can be written as a sum of positive squares in 2 ways, for example, as 31002624 + 280227600 = 5568^2 + 16740^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 311230197 and 311230206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20094 + ... + 32034.

Almost surely, 2^311230224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311230224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (437948966).

311230224 is an abundant number, since it is smaller than the sum of its proper divisors (564667708).

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

311230224 is a wasteful number, since it uses less digits than its factorization.

311230224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12136 (or 12127 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 311230224 is about 17641.7182836593. The cubic root of 311230224 is about 677.6840358235.

Adding to 311230224 its reverse (422032113), we get a palindrome (733262337).

The spelling of 311230224 in words is "three hundred eleven million, two hundred thirty thousand, two hundred twenty-four".