331028609 has 2 divisors, whose sum is σ = 331028610. Its totient is φ = 331028608.

The previous prime is 331028587. The next prime is 331028653. The reversal of 331028609 is 906820133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276490384 + 54538225 = 16628^2 + 7385^2 .

It is a cyclic number.

It is not a de Polignac number, because 331028609 - 2⁸ = 331028353 is a prime.

It is not a weakly prime, because it can be changed into another prime (331028689) 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 as a sum of consecutive naturals, namely, 165514304 + 165514305.

It is an arithmetic number, because the mean of its divisors is an integer number (165514305).

Almost surely, 2^331028609 is an apocalyptic number.

It is an amenable number.

331028609 is a deficient number, since it is larger than the sum of its proper divisors (1).

331028609 is an equidigital number, since it uses as much as digits as its factorization.

331028609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 331028609 is about 18194.1916280993. The cubic root of 331028609 is about 691.7595705726.

The spelling of 331028609 in words is "three hundred thirty-one million, twenty-eight thousand, six hundred nine".