331405321 has 16 divisors (see below), whose sum is σ = 374701824. Its totient is φ = 290816064.

The previous prime is 331405313. The next prime is 331405331. The reversal of 331405321 is 123504133.

It is a cyclic number.

It is not a de Polignac number, because 331405321 - 2³ = 331405313 is a prime.

It is a super-2 number, since 2×331405321² = 219658973574226082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331405292 and 331405301.

It is not an unprimeable number, because it can be changed into a prime (331405331) 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 15 ways as a sum of consecutive naturals, for example, 46615 + ... + 53251.

It is an arithmetic number, because the mean of its divisors is an integer number (23418864).

Almost surely, 2^331405321 is an apocalyptic number.

It is an amenable number.

331405321 is a deficient number, since it is larger than the sum of its proper divisors (43296503).

331405321 is a wasteful number, since it uses less digits than its factorization.

331405321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 331405321 is about 18204.5412191574. The cubic root of 331405321 is about 692.0218795637.

Adding to 331405321 its reverse (123504133), we get a palindrome (454909454).

The spelling of 331405321 in words is "three hundred thirty-one million, four hundred five thousand, three hundred twenty-one".