18194081 has 4 divisors (see below), whose sum is σ = 18985152. Its totient is φ = 17403012.

The previous prime is 18194069. The next prime is 18194083. The reversal of 18194081 is 18049181.

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.

It is a cyclic number.

It is not a de Polignac number, because 18194081 - 2¹⁰ = 18193057 is a prime.

It is a super-2 number, since 2×18194081² = 662049166869122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18194083) 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, 395501 + ... + 395546.

It is an arithmetic number, because the mean of its divisors is an integer number (4746288).

Almost surely, 2^18194081 is an apocalyptic number.

It is an amenable number.

18194081 is a deficient number, since it is larger than the sum of its proper divisors (791071).

18194081 is an equidigital number, since it uses as much as digits as its factorization.

18194081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791070.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18194081 is about 4265.4520276285. The cubic root of 18194081 is about 263.0126929351.

The spelling of 18194081 in words is "eighteen million, one hundred ninety-four thousand, eighty-one".