331904321 has 8 divisors (see below), whose sum is σ = 391555584. Its totient is φ = 275312160.

The previous prime is 331904299. The next prime is 331904341. The reversal of 331904321 is 123409133.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 331904321 - 2²² = 327710017 is a prime.

It is a super-2 number, since 2×331904321² = 220320956596942082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331904341) 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 7 ways as a sum of consecutive naturals, for example, 764540 + ... + 764973.

It is an arithmetic number, because the mean of its divisors is an integer number (48944448).

Almost surely, 2^331904321 is an apocalyptic number.

331904321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

331904321 is a deficient number, since it is larger than the sum of its proper divisors (59651263).

331904321 is a wasteful number, since it uses less digits than its factorization.

331904321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529551.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 331904321 is about 18218.2414354405. The cubic root of 331904321 is about 692.3690332597.

The spelling of 331904321 in words is "three hundred thirty-one million, nine hundred four thousand, three hundred twenty-one".