9999609 has 4 divisors (see below), whose sum is σ = 13332816. Its totient is φ = 6666404.

The previous prime is 9999601. The next prime is 9999637. The reversal of 9999609 is 9069999.

9999609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 9999609 - 2³ = 9999601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9999601) 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, 1666599 + ... + 1666604.

It is an arithmetic number, because the mean of its divisors is an integer number (3333204).

Almost surely, 2^9999609 is an apocalyptic number.

It is an amenable number.

9999609 is a deficient number, since it is larger than the sum of its proper divisors (3333207).

9999609 is a wasteful number, since it uses less digits than its factorization.

9999609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333206.

The product of its (nonzero) digits is 354294, while the sum is 51.

The square root of 9999609 is about 3162.2158370358. The cubic root of 9999609 is about 215.4406610200.

The spelling of 9999609 in words is "nine million, nine hundred ninety-nine thousand, six hundred nine".