1009869565 has 16 divisors (see below), whose sum is σ = 1258903296. Its totient is φ = 777078400.

The previous prime is 1009869529. The next prime is 1009869593. The reversal of 1009869565 is 5659689001.

It is not a de Polignac number, because 1009869565 - 2⁹ = 1009869053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20137 + ... + 49246.

It is an arithmetic number, because the mean of its divisors is an integer number (78681456).

Almost surely, 2^1009869565 is an apocalyptic number.

It is an amenable number.

1009869565 is a deficient number, since it is larger than the sum of its proper divisors (249033731).

1009869565 is an equidigital number, since it uses as much as digits as its factorization.

1009869565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69500.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 1009869565 is about 31778.4449745421. Note that the first 3 decimals coincide. The cubic root of 1009869565 is about 1003.2790908107.

The spelling of 1009869565 in words is "one billion, nine million, eight hundred sixty-nine thousand, five hundred sixty-five".