618609 has 4 divisors (see below), whose sum is σ = 824816. Its totient is φ = 412404.

The previous prime is 618593. The next prime is 618619. The reversal of 618609 is 906816.

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 not a de Polignac number, because 618609 - 2⁴ = 618593 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618619) 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, 103099 + ... + 103104.

It is an arithmetic number, because the mean of its divisors is an integer number (206204).

2⁶¹⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

618609 is a deficient number, since it is larger than the sum of its proper divisors (206207).

618609 is a wasteful number, since it uses less digits than its factorization.

618609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206206.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 618609 is about 786.5170055377. The cubic root of 618609 is about 85.2063728179.

The spelling of 618609 in words is "six hundred eighteen thousand, six hundred nine".