320312989 has 2 divisors, whose sum is σ = 320312990. Its totient is φ = 320312988.

The previous prime is 320312983. The next prime is 320313017. The reversal of 320312989 is 989213023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198387225 + 121925764 = 14085^2 + 11042^2 .

It is a cyclic number.

It is not a de Polignac number, because 320312989 - 2⁵ = 320312957 is a prime.

It is a super-2 number, since 2×320312989² = 205200821844228242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320312983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160156494 + 160156495.

It is an arithmetic number, because the mean of its divisors is an integer number (160156495).

Almost surely, 2^320312989 is an apocalyptic number.

It is an amenable number.

320312989 is a deficient number, since it is larger than the sum of its proper divisors (1).

320312989 is an equidigital number, since it uses as much as digits as its factorization.

320312989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 320312989 is about 17897.2899903868. The cubic root of 320312989 is about 684.2133075306.

The spelling of 320312989 in words is "three hundred twenty million, three hundred twelve thousand, nine hundred eighty-nine".