19009001 has 4 divisors (see below), whose sum is σ = 20737104. Its totient is φ = 17280900.

The previous prime is 19008991. The next prime is 19009013. The reversal of 19009001 is 10090091.

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: 10090091 = 11 ⋅917281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19009001 is a prime.

It is a super-2 number, since 2×19009001² = 722684238036002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19009031) 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, 864035 + ... + 864056.

It is an arithmetic number, because the mean of its divisors is an integer number (5184276).

Almost surely, 2^19009001 is an apocalyptic number.

19009001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19009001 is a deficient number, since it is larger than the sum of its proper divisors (1728103).

19009001 is a wasteful number, since it uses less digits than its factorization.

19009001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728102.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 19009001 is about 4359.9313067983. The cubic root of 19009001 is about 266.8822955590.

Adding to 19009001 its reverse (10090091), we get a palindrome (29099092).

It can be divided in two parts, 1900 and 9001, that added together give a palindrome (10901).

The spelling of 19009001 in words is "nineteen million, nine thousand, one".