331381881 has 8 divisors (see below), whose sum is σ = 490936160. Its totient is φ = 220921236.

The previous prime is 331381823. The next prime is 331381891. The reversal of 331381881 is 188183133.

It is not a de Polignac number, because 331381881 - 2¹¹ = 331379833 is a prime.

It is a super-2 number, since 2×331381881² = 219627902110196322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (331381891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6136675 + ... + 6136728.

It is an arithmetic number, because the mean of its divisors is an integer number (61367020).

Almost surely, 2^331381881 is an apocalyptic number.

It is an amenable number.

331381881 is a deficient number, since it is larger than the sum of its proper divisors (159554279).

331381881 is a wasteful number, since it uses less digits than its factorization.

331381881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12273412 (or 12273406 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 331381881 is about 18203.8974123675. The cubic root of 331381881 is about 692.0055638175.

The spelling of 331381881 in words is "three hundred thirty-one million, three hundred eighty-one thousand, eight hundred eighty-one".