609899 has 4 divisors (see below), whose sum is σ = 630960. Its totient is φ = 588840.

The previous prime is 609887. The next prime is 609907. The reversal of 609899 is 998906.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-609899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10487 + ... + 10544.

It is an arithmetic number, because the mean of its divisors is an integer number (157740).

2⁶⁰⁹⁸⁹⁹ is an apocalyptic number.

609899 is a deficient number, since it is larger than the sum of its proper divisors (21061).

609899 is a wasteful number, since it uses less digits than its factorization.

609899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21060.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 609899 is about 780.9603062896. The cubic root of 609899 is about 84.8045798968.

The spelling of 609899 in words is "six hundred nine thousand, eight hundred ninety-nine".