320979889 has 2 divisors, whose sum is σ = 320979890. Its totient is φ = 320979888.

The previous prime is 320979877. The next prime is 320979899. The reversal of 320979889 is 988979023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317445489 + 3534400 = 17817^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 320979889 - 2¹⁷ = 320848817 is a prime.

It is not a weakly prime, because it can be changed into another prime (320979809) 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, 160489944 + 160489945.

It is an arithmetic number, because the mean of its divisors is an integer number (160489945).

Almost surely, 2^320979889 is an apocalyptic number.

It is an amenable number.

320979889 is a deficient number, since it is larger than the sum of its proper divisors (1).

320979889 is an equidigital number, since it uses as much as digits as its factorization.

320979889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 320979889 is about 17915.9116150979. The cubic root of 320979889 is about 684.6878283470.

The spelling of 320979889 in words is "three hundred twenty million, nine hundred seventy-nine thousand, eight hundred eighty-nine".