313231212 has 120 divisors (see below), whose sum is σ = 942568704. Its totient is φ = 88851168.

The previous prime is 313231211. The next prime is 313231213. The reversal of 313231212 is 212132313.

It is an interprime number because it is at equal distance from previous prime (313231211) and next prime (313231213).

It is a super-2 number, since 2×313231212² = 196227584341977888, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (313231211) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 378343 + ... + 379169.

Almost surely, 2^313231212 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 313231212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (471284352).

313231212 is an abundant number, since it is smaller than the sum of its proper divisors (629337492).

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

313231212 is a wasteful number, since it uses less digits than its factorization.

313231212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017 (or 1006 counting only the distinct ones).

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

The square root of 313231212 is about 17698.3392441212. The cubic root of 313231212 is about 679.1332757937.

Adding to 313231212 its reverse (212132313), we get a palindrome (525363525).

The spelling of 313231212 in words is "three hundred thirteen million, two hundred thirty-one thousand, two hundred twelve".