18196181 has 8 divisors (see below), whose sum is σ = 18701760. Its totient is φ = 17694432.

The previous prime is 18196141. The next prime is 18196183. The reversal of 18196181 is 18169181.

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 18196181 - 2¹⁴ = 18179797 is a prime.

It is a super-2 number, since 2×18196181² = 662202005969522, which contains 22 as substring.

18196181 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18196183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10505 + ... + 12113.

It is an arithmetic number, because the mean of its divisors is an integer number (2337720).

Almost surely, 2^18196181 is an apocalyptic number.

It is an amenable number.

18196181 is a deficient number, since it is larger than the sum of its proper divisors (505579).

18196181 is a wasteful number, since it uses less digits than its factorization.

18196181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915.

The product of its digits is 3456, while the sum is 35.

The square root of 18196181 is about 4265.6981843539. The cubic root of 18196181 is about 263.0228117095.

Subtracting from 18196181 its reverse (18169181), we obtain a cube (27000 = 30³).

It can be divided in two parts, 1819 and 6181, that added together give a cube (8000 = 20³).

The spelling of 18196181 in words is "eighteen million, one hundred ninety-six thousand, one hundred eighty-one".