199990181 has 8 divisors (see below), whose sum is σ = 211401600. Its totient is φ = 188667360.

The previous prime is 199990151. The next prime is 199990183. The reversal of 199990181 is 181099991.

It is a happy number.

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 199990181 - 2¹⁰ = 199989157 is a prime.

It is a super-3 number, since 3×199990181³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199990183) 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, 17480 + ... + 26561.

It is an arithmetic number, because the mean of its divisors is an integer number (26425200).

Almost surely, 2^199990181 is an apocalyptic number.

It is an amenable number.

199990181 is a deficient number, since it is larger than the sum of its proper divisors (11411419).

199990181 is a wasteful number, since it uses less digits than its factorization.

199990181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44299.

The product of its (nonzero) digits is 52488, while the sum is 47.

The square root of 199990181 is about 14141.7884653957. The cubic root of 199990181 is about 584.7939771759.

The spelling of 199990181 in words is "one hundred ninety-nine million, nine hundred ninety thousand, one hundred eighty-one".