311232213 has 12 divisors (see below), whose sum is σ = 466208288. Its totient is φ = 207487980.

The previous prime is 311232211. The next prime is 311232227. The reversal of 311232213 is 312232113.

It is not a de Polignac number, because 311232213 - 2¹ = 311232211 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 (311232211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640153 + ... + 640638.

Almost surely, 2^311232213 is an apocalyptic number.

It is an amenable number.

311232213 is a deficient number, since it is larger than the sum of its proper divisors (154976075).

311232213 is an equidigital number, since it uses as much as digits as its factorization.

311232213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280806 (or 1280794 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 311232213 is about 17641.7746556292. The cubic root of 311232213 is about 677.6854794608.

Adding to 311232213 its reverse (312232113), we get a palindrome (623464326).

The spelling of 311232213 in words is "three hundred eleven million, two hundred thirty-two thousand, two hundred thirteen".