190181 has 2 divisors, whose sum is σ = 190182. Its totient is φ = 190180.

The previous prime is 190159. The next prime is 190207. The reversal of 190181 is 181091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172225 + 17956 = 415^2 + 134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190181 is a prime.

It is a super-2 number, since 2×190181² = 72337625522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95090 + 95091.

It is an arithmetic number, because the mean of its divisors is an integer number (95091).

2¹⁹⁰¹⁸¹ is an apocalyptic number.

It is an amenable number.

190181 is a deficient number, since it is larger than the sum of its proper divisors (1).

190181 is an equidigital number, since it uses as much as digits as its factorization.

190181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 190181 is about 436.0974661701. The cubic root of 190181 is about 57.5072202653.

The spelling of 190181 in words is "one hundred ninety thousand, one hundred eighty-one".