18106169 has 4 divisors (see below), whose sum is σ = 18285540. Its totient is φ = 17926800.

The previous prime is 18106163. The next prime is 18106171. The reversal of 18106169 is 96160181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9765625 + 8340544 = 3125^2 + 2888^2 .

It is a cyclic number.

It is not a de Polignac number, because 18106169 - 2²⁴ = 1328953 is a prime.

It is a super-2 number, since 2×18106169² = 655666711713122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18106163) 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, 89534 + ... + 89735.

It is an arithmetic number, because the mean of its divisors is an integer number (4571385).

Almost surely, 2^18106169 is an apocalyptic number.

It is an amenable number.

18106169 is a deficient number, since it is larger than the sum of its proper divisors (179371).

18106169 is a wasteful number, since it uses less digits than its factorization.

18106169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179370.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18106169 is about 4255.1344279588. The cubic root of 18106169 is about 262.5883916989.

The spelling of 18106169 in words is "eighteen million, one hundred six thousand, one hundred sixty-nine".