1009989609 has 4 divisors (see below), whose sum is σ = 1346652816. Its totient is φ = 673326404.

The previous prime is 1009989587. The next prime is 1009989611. The reversal of 1009989609 is 9069899001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9069899001 = 3 ⋅3023299667.

It is a cyclic number.

It is not a de Polignac number, because 1009989609 - 2⁵ = 1009989577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1009989649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168331599 + ... + 168331604.

It is an arithmetic number, because the mean of its divisors is an integer number (336663204).

Almost surely, 2^1009989609 is an apocalyptic number.

It is an amenable number.

1009989609 is a deficient number, since it is larger than the sum of its proper divisors (336663207).

1009989609 is an equidigital number, since it uses as much as digits as its factorization.

1009989609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336663206.

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 1009989609 is about 31780.3336829556. Note that the first 3 decimals coincide. The cubic root of 1009989609 is about 1003.3188427640.

The spelling of 1009989609 in words is "one billion, nine million, nine hundred eighty-nine thousand, six hundred nine".