19081 has 2 divisors, whose sum is σ = 19082. Its totient is φ = 19080.

The previous prime is 19079. The next prime is 19087. The reversal of 19081 is 18091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13456 + 5625 = 116^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 19081 - 2¹ = 19079 is a prime.

It is a super-2 number, since 2×19081² = 728169122, which contains 22 as substring.

Together with 19079, it forms a pair of twin primes.

It is a Chen prime.

19081 is a lucky number.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (19087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9540 + 9541.

It is an arithmetic number, because the mean of its divisors is an integer number (9541).

2¹⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

19081 is a deficient number, since it is larger than the sum of its proper divisors (1).

19081 is an equidigital number, since it uses as much as digits as its factorization.

19081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 19081 is about 138.1339929199. The cubic root of 19081 is about 26.7218821209.

Subtracting from 19081 its reverse (18091), we obtain a triangular number (990 = T₄₄).

The spelling of 19081 in words is "nineteen thousand, eighty-one".