987869209 has 2 divisors, whose sum is σ = 987869210. Its totient is φ = 987869208.

The previous prime is 987869203. The next prime is 987869213. The reversal of 987869209 is 902968789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 829612809 + 158256400 = 28803^2 + 12580^2 .

It is a cyclic number.

It is not a de Polignac number, because 987869209 - 2⁷ = 987869081 is a prime.

It is not a weakly prime, because it can be changed into another prime (987869203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493934604 + 493934605.

It is an arithmetic number, because the mean of its divisors is an integer number (493934605).

Almost surely, 2^987869209 is an apocalyptic number.

It is an amenable number.

987869209 is a deficient number, since it is larger than the sum of its proper divisors (1).

987869209 is an equidigital number, since it uses as much as digits as its factorization.

987869209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The square root of 987869209 is about 31430.3867141338. The cubic root of 987869209 is about 995.9399412316.

The spelling of 987869209 in words is "nine hundred eighty-seven million, eight hundred sixty-nine thousand, two hundred nine".