987446809 has 2 divisors, whose sum is σ = 987446810. Its totient is φ = 987446808.

The previous prime is 987446791. The next prime is 987446843. The reversal of 987446809 is 908644789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 977187600 + 10259209 = 31260^2 + 3203^2 .

It is a cyclic number.

It is not a de Polignac number, because 987446809 - 2⁹ = 987446297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 987446809.

It is not a weakly prime, because it can be changed into another prime (987446849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493723404 + 493723405.

It is an arithmetic number, because the mean of its divisors is an integer number (493723405).

Almost surely, 2^987446809 is an apocalyptic number.

It is an amenable number.

987446809 is a deficient number, since it is larger than the sum of its proper divisors (1).

987446809 is an equidigital number, since it uses as much as digits as its factorization.

987446809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 987446809 is about 31423.6663837942. Note that the first 3 decimals coincide. The cubic root of 987446809 is about 995.7979706814.

The spelling of 987446809 in words is "nine hundred eighty-seven million, four hundred forty-six thousand, eight hundred nine".