19042109 has 4 divisors (see below), whose sum is σ = 19271616. Its totient is φ = 18812604.

The previous prime is 19042103. The next prime is 19042139. The reversal of 19042109 is 90124091.

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 19042109 - 2¹² = 19038013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19042103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114629 + ... + 114794.

It is an arithmetic number, because the mean of its divisors is an integer number (4817904).

Almost surely, 2^19042109 is an apocalyptic number.

It is an amenable number.

19042109 is a deficient number, since it is larger than the sum of its proper divisors (229507).

19042109 is an equidigital number, since it uses as much as digits as its factorization.

19042109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229506.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 19042109 is about 4363.7265038038. The cubic root of 19042109 is about 267.0371487632.

The spelling of 19042109 in words is "nineteen million, forty-two thousand, one hundred nine".