320919889 has 2 divisors, whose sum is σ = 320919890. Its totient is φ = 320919888.

The previous prime is 320919853. The next prime is 320919953. The reversal of 320919889 is 988919023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195300625 + 125619264 = 13975^2 + 11208^2 .

It is a cyclic number.

It is not a de Polignac number, because 320919889 - 2¹³ = 320911697 is a prime.

It is not a weakly prime, because it can be changed into another prime (320979889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160459944 + 160459945.

It is an arithmetic number, because the mean of its divisors is an integer number (160459945).

Almost surely, 2^320919889 is an apocalyptic number.

It is an amenable number.

320919889 is a deficient number, since it is larger than the sum of its proper divisors (1).

320919889 is an equidigital number, since it uses as much as digits as its factorization.

320919889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 320919889 is about 17914.2370476669. The cubic root of 320919889 is about 684.6451633378.

The spelling of 320919889 in words is "three hundred twenty million, nine hundred nineteen thousand, eight hundred eighty-nine".