331320217 has 2 divisors, whose sum is σ = 331320218. Its totient is φ = 331320216.

The previous prime is 331320193. The next prime is 331320277. The reversal of 331320217 is 712023133.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251825161 + 79495056 = 15869^2 + 8916^2 .

It is a cyclic number.

It is not a de Polignac number, because 331320217 - 2¹⁹ = 330795929 is a prime.

It is not a weakly prime, because it can be changed into another prime (331320277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165660108 + 165660109.

It is an arithmetic number, because the mean of its divisors is an integer number (165660109).

Almost surely, 2^331320217 is an apocalyptic number.

It is an amenable number.

331320217 is a deficient number, since it is larger than the sum of its proper divisors (1).

331320217 is an equidigital number, since it uses as much as digits as its factorization.

331320217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 331320217 is about 18202.2036303300. The cubic root of 331320217 is about 691.9626380365.

The spelling of 331320217 in words is "three hundred thirty-one million, three hundred twenty thousand, two hundred seventeen".