18088181 has 4 divisors (see below), whose sum is σ = 18101664. Its totient is φ = 18074700.

The previous prime is 18088177. The next prime is 18088207. The reversal of 18088181 is 18188081.

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: 18188081 = 3167 ⋅5743.

It is a cyclic number.

It is not a de Polignac number, because 18088181 - 2² = 18088177 is a prime.

It is a super-2 number, since 2×18088181² = 654364583777522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18088121) 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, 4475 + ... + 7496.

It is an arithmetic number, because the mean of its divisors is an integer number (4525416).

Almost surely, 2^18088181 is an apocalyptic number.

It is an amenable number.

18088181 is a deficient number, since it is larger than the sum of its proper divisors (13483).

18088181 is a wasteful number, since it uses less digits than its factorization.

18088181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13482.

The product of its (nonzero) digits is 4096, while the sum is 35.

The square root of 18088181 is about 4253.0202209724. The cubic root of 18088181 is about 262.5014046788.

The spelling of 18088181 in words is "eighteen million, eighty-eight thousand, one hundred eighty-one".