331481891 has 8 divisors (see below), whose sum is σ = 357732480. Its totient is φ = 305338752.

The previous prime is 331481881. The next prime is 331481893. The reversal of 331481891 is 198184133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331481891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331481893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20390 + ... + 32843.

It is an arithmetic number, because the mean of its divisors is an integer number (44716560).

Almost surely, 2^331481891 is an apocalyptic number.

331481891 is a deficient number, since it is larger than the sum of its proper divisors (26250589).

331481891 is a wasteful number, since it uses less digits than its factorization.

331481891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53725.

The product of its digits is 20736, while the sum is 38.

The square root of 331481891 is about 18206.6441443776. The cubic root of 331481891 is about 692.0751718432.

The spelling of 331481891 in words is "three hundred thirty-one million, four hundred eighty-one thousand, eight hundred ninety-one".