18711161 has 8 divisors (see below), whose sum is σ = 21509184. Its totient is φ = 15944400.

The previous prime is 18711139. The next prime is 18711163. The reversal of 18711161 is 16111781.

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

It is a cyclic number.

It is not a de Polignac number, because 18711161 - 2¹⁰ = 18710137 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 18711161.

It is not an unprimeable number, because it can be changed into a prime (18711163) 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, 6515 + ... + 8936.

It is an arithmetic number, because the mean of its divisors is an integer number (2688648).

Almost surely, 2^18711161 is an apocalyptic number.

It is an amenable number.

18711161 is a deficient number, since it is larger than the sum of its proper divisors (2798023).

18711161 is a wasteful number, since it uses less digits than its factorization.

18711161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15631.

The product of its digits is 336, while the sum is 26.

The square root of 18711161 is about 4325.6399526544. The cubic root of 18711161 is about 265.4810817332.

The spelling of 18711161 in words is "eighteen million, seven hundred eleven thousand, one hundred sixty-one".