18135161 has 16 divisors (see below), whose sum is σ = 20563200. Its totient is φ = 15849600.

The previous prime is 18135151. The next prime is 18135163. The reversal of 18135161 is 16153181.

It is a cyclic number.

It is not a de Polignac number, because 18135161 - 2⁶ = 18135097 is a prime.

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 18135161.

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 15 ways as a sum of consecutive naturals, for example, 35375 + ... + 35883.

It is an arithmetic number, because the mean of its divisors is an integer number (1285200).

Almost surely, 2^18135161 is an apocalyptic number.

18135161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18135161 is a deficient number, since it is larger than the sum of its proper divisors (2428039).

18135161 is a wasteful number, since it uses less digits than its factorization.

18135161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its digits is 720, while the sum is 26.

The square root of 18135161 is about 4258.5397732087. The cubic root of 18135161 is about 262.7284710813.

The spelling of 18135161 in words is "eighteen million, one hundred thirty-five thousand, one hundred sixty-one".