19010081 has 4 divisors (see below), whose sum is σ = 19095552. Its totient is φ = 18924612.

The previous prime is 19010077. The next prime is 19010083. The reversal of 19010081 is 18001091.

19010081 is nontrivially palindromic in base 4 and base 16.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19010081 - 2² = 19010077 is a prime.

It is a super-2 number, since 2×19010081² = 722766359253122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19010083) 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, 42401 + ... + 42846.

It is an arithmetic number, because the mean of its divisors is an integer number (4773888).

Almost surely, 2^19010081 is an apocalyptic number.

It is an amenable number.

19010081 is a deficient number, since it is larger than the sum of its proper divisors (85471).

19010081 is an equidigital number, since it uses as much as digits as its factorization.

19010081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85470.

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

The square root of 19010081 is about 4360.0551602015. The cubic root of 19010081 is about 266.8873497860.

The spelling of 19010081 in words is "nineteen million, ten thousand, eighty-one".