19000001 has 4 divisors (see below), whose sum is σ = 19826112. Its totient is φ = 18173892.

The previous prime is 18999997. The next prime is 19000013. The reversal of 19000001 is 10000091.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10000091 = 251 ⋅39841.

It is a cyclic number.

It is not a de Polignac number, because 19000001 - 2² = 18999997 is a prime.

It is a super-2 number, since 2×19000001² = 722000076000002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19000031) 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 in 3 ways as a sum of consecutive naturals, for example, 413021 + ... + 413066.

It is an arithmetic number, because the mean of its divisors is an integer number (4956528).

Almost surely, 2^19000001 is an apocalyptic number.

It is an amenable number.

19000001 is a deficient number, since it is larger than the sum of its proper divisors (826111).

19000001 is an equidigital number, since it uses as much as digits as its factorization.

19000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826110.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 19000001 is about 4358.8990582485. The cubic root of 19000001 is about 266.8401695536.

Adding to 19000001 its reverse (10000091), we get a palindrome (29000092).

The spelling of 19000001 in words is "nineteen million, one", and thus it is an aban number and an uban number.