331000000 has 98 divisors (see below), whose sum is σ = 823505084. Its totient is φ = 132000000.

The previous prime is 330999959. The next prime is 331000001. The reversal of 331000000 is 133.

It is a happy number.

It is a super-2 number, since 2×331000000² = 219122000000000000, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (331000001) 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 13 ways as a sum of consecutive naturals, for example, 999835 + ... + 1000165.

Almost surely, 2^331000000 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 331000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411752542).

331000000 is an abundant number, since it is smaller than the sum of its proper divisors (492505084).

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

331000000 is an frugal number, since it uses more digits than its factorization.

331000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 7.

The square root of 331000000 is about 18193.4053986603. The cubic root of 331000000 is about 691.7396416609.

Adding to 331000000 its reverse (133), we get a palindrome (331000133).

The spelling of 331000000 in words is "three hundred thirty-one million", and thus it is an aban number.