660109 has 4 divisors (see below), whose sum is σ = 665280. Its totient is φ = 654940.

The previous prime is 660103. The next prime is 660119. The reversal of 660109 is 901066.

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: 901066 = 2 ⋅450533.

It is a cyclic number.

It is not a de Polignac number, because 660109 - 2⁹ = 659597 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660103) 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, 2389 + ... + 2650.

It is an arithmetic number, because the mean of its divisors is an integer number (166320).

2⁶⁶⁰¹⁰⁹ is an apocalyptic number.

It is an amenable number.

660109 is a deficient number, since it is larger than the sum of its proper divisors (5171).

660109 is a wasteful number, since it uses less digits than its factorization.

660109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5170.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 660109 is about 812.4709225566. The cubic root of 660109 is about 87.0706696684.

The spelling of 660109 in words is "six hundred sixty thousand, one hundred nine".