331213312 has 40 divisors (see below), whose sum is σ = 700726356. Its totient is φ = 155860992.

The previous prime is 331213297. The next prime is 331213313. The reversal of 331213312 is 213312133.

It can be written as a sum of positive squares in 2 ways, for example, as 327465216 + 3748096 = 18096^2 + 1936^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 331213312.

It is not an unprimeable number, because it can be changed into a prime (331213313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10323 + ... + 27730.

Almost surely, 2^331213312 is an apocalyptic number.

331213312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

331213312 is an abundant number, since it is smaller than the sum of its proper divisors (369513044).

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

331213312 is an equidigital number, since it uses as much as digits as its factorization.

331213312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38088 (or 38072 counting only the distinct ones).

The product of its digits is 324, while the sum is 19.

The square root of 331213312 is about 18199.2667984180. The cubic root of 331213312 is about 691.8882062937. Note that the first 3 decimals are identical.

Adding to 331213312 its reverse (213312133), we get a palindrome (544525445).

The spelling of 331213312 in words is "three hundred thirty-one million, two hundred thirteen thousand, three hundred twelve".