19112005 has 16 divisors (see below), whose sum is σ = 26337600. Its totient is φ = 13167360.

The previous prime is 19111999. The next prime is 19112021. The reversal of 19112005 is 50021191.

It is not a de Polignac number, because 19112005 - 2⁵ = 19111973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8100 + ... + 10189.

It is an arithmetic number, because the mean of its divisors is an integer number (1646100).

Almost surely, 2^19112005 is an apocalyptic number.

It is an amenable number.

19112005 is a deficient number, since it is larger than the sum of its proper divisors (7225595).

19112005 is a wasteful number, since it uses less digits than its factorization.

19112005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18324.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 19112005 is about 4371.7279192557. The cubic root of 19112005 is about 267.3634788274.

Adding to 19112005 its reverse (50021191), we get a palindrome (69133196).

It can be divided in two parts, 1911 and 2005, that added together give a triangular number (3916 = T₈₈).

The spelling of 19112005 in words is "nineteen million, one hundred twelve thousand, five".