19091 has 4 divisors (see below), whose sum is σ = 20232.
Its totient is φ = 17952.
The previous prime is 19087. The next prime is 19121.
19091 is nontrivially palindromic in base 10.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 19091 - 22 = 19087 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (19001) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 578.
It is an arithmetic number, because the mean of its divisors is an integer number (5058).
219091 is an apocalyptic number.
19091 is a deficient number, since it is larger than the sum of its proper divisors (1141).
19091 is a wasteful number, since it uses less digits than its factorization.
19091 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1140.
The product of its (nonzero) digits is 81, while the sum is 20.
The square root of 19091 is about 138.1701849170.
The cubic root of 19091 is about 26.7265494541.
The spelling of 19091 in words is "nineteen thousand, ninety-one".