989475857 has 2 divisors, whose sum is σ = 989475858. Its totient is φ = 989475856.

The previous prime is 989475841. The next prime is 989475983. The reversal of 989475857 is 758574989.

989475857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 925619776 + 63856081 = 30424^2 + 7991^2 .

It is a cyclic number.

It is not a de Polignac number, because 989475857 - 2⁴ = 989475841 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989475857.

It is not a weakly prime, because it can be changed into another prime (989475827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494737928 + 494737929.

It is an arithmetic number, because the mean of its divisors is an integer number (494737929).

Almost surely, 2^989475857 is an apocalyptic number.

It is an amenable number.

989475857 is a deficient number, since it is larger than the sum of its proper divisors (1).

989475857 is an equidigital number, since it uses as much as digits as its factorization.

989475857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 62.

The square root of 989475857 is about 31455.9351633360. The cubic root of 989475857 is about 996.4795734738.

The spelling of 989475857 in words is "nine hundred eighty-nine million, four hundred seventy-five thousand, eight hundred fifty-seven".