199081 has 2 divisors, whose sum is σ = 199082. Its totient is φ = 199080.

The previous prime is 199049. The next prime is 199103. The reversal of 199081 is 180991.

199081 = 315² + 316².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99856 + 99225 = 316^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 199081 - 2⁵ = 199049 is a prime.

It is a super-2 number, since 2×199081² = 79266489122, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (199021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99540 + 99541.

It is an arithmetic number, because the mean of its divisors is an integer number (99541).

2¹⁹⁹⁰⁸¹ is an apocalyptic number.

199081 is the 316-th centered square number.

It is an amenable number.

199081 is a deficient number, since it is larger than the sum of its proper divisors (1).

199081 is an equidigital number, since it uses as much as digits as its factorization.

199081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 199081 is about 446.1849392348. The cubic root of 199081 is about 58.3906448078.

The spelling of 199081 in words is "one hundred ninety-nine thousand, eighty-one".