331042321 has 2 divisors, whose sum is σ = 331042322. Its totient is φ = 331042320.

The previous prime is 331042319. The next prime is 331042351. The reversal of 331042321 is 123240133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247118400 + 83923921 = 15720^2 + 9161^2 .

It is a cyclic number.

It is not a de Polignac number, because 331042321 - 2¹ = 331042319 is a prime.

Together with 331042319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (331042351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165521160 + 165521161.

It is an arithmetic number, because the mean of its divisors is an integer number (165521161).

Almost surely, 2^331042321 is an apocalyptic number.

It is an amenable number.

331042321 is a deficient number, since it is larger than the sum of its proper divisors (1).

331042321 is an equidigital number, since it uses as much as digits as its factorization.

331042321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 331042321 is about 18194.5684477539. The cubic root of 331042321 is about 691.7691218883.

Adding to 331042321 its reverse (123240133), we get a palindrome (454282454).

The spelling of 331042321 in words is "three hundred thirty-one million, forty-two thousand, three hundred twenty-one".