19121109 has 16 divisors (see below), whose sum is σ = 29538432. Its totient is φ = 10775808.

The previous prime is 19121101. The next prime is 19121117. The reversal of 19121109 is 90112191.

It is an interprime number because it is at equal distance from previous prime (19121101) and next prime (19121117).

It is not a de Polignac number, because 19121109 - 2³ = 19121101 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19121101) 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 15 ways as a sum of consecutive naturals, for example, 4704 + ... + 7769.

It is an arithmetic number, because the mean of its divisors is an integer number (1846152).

Almost surely, 2^19121109 is an apocalyptic number.

It is an amenable number.

19121109 is a deficient number, since it is larger than the sum of its proper divisors (10417323).

19121109 is a wasteful number, since it uses less digits than its factorization.

19121109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12556.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 19121109 is about 4372.7690311746. The cubic root of 19121109 is about 267.4059249360.

The spelling of 19121109 in words is "nineteen million, one hundred twenty-one thousand, one hundred nine".