18135169 has 8 divisors (see below), whose sum is σ = 19899432. Its totient is φ = 16423680.

The previous prime is 18135167. The next prime is 18135181. The reversal of 18135169 is 96153181.

It can be written as a sum of positive squares in 4 ways, for example, as 5461569 + 12673600 = 2337^2 + 3560^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18135169 - 2¹ = 18135167 is a prime.

It is a super-2 number, since 2×18135169² = 657768709317122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18135163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12472 + ... + 13849.

It is an arithmetic number, because the mean of its divisors is an integer number (2487429).

Almost surely, 2^18135169 is an apocalyptic number.

It is an amenable number.

18135169 is a deficient number, since it is larger than the sum of its proper divisors (1764263).

18135169 is a wasteful number, since it uses less digits than its factorization.

18135169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26387.

The product of its digits is 6480, while the sum is 34.

The square root of 18135169 is about 4258.5407124977. The cubic root of 18135169 is about 262.7285097139.

The spelling of 18135169 in words is "eighteen million, one hundred thirty-five thousand, one hundred sixty-nine".