331028689 has 2 divisors, whose sum is σ = 331028690. Its totient is φ = 331028688.

The previous prime is 331028653. The next prime is 331028701. The reversal of 331028689 is 986820133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268697664 + 62331025 = 16392^2 + 7895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331028689 is a prime.

It is not a weakly prime, because it can be changed into another prime (331028609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165514344 + 165514345.

It is an arithmetic number, because the mean of its divisors is an integer number (165514345).

Almost surely, 2^331028689 is an apocalyptic number.

It is an amenable number.

331028689 is a deficient number, since it is larger than the sum of its proper divisors (1).

331028689 is an equidigital number, since it uses as much as digits as its factorization.

331028689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 331028689 is about 18194.1938266030. The cubic root of 331028689 is about 691.7596262986.

The spelling of 331028689 in words is "three hundred thirty-one million, twenty-eight thousand, six hundred eighty-nine".