19225609 has 6 divisors (see below), whose sum is σ = 20818446. Its totient is φ = 17746560.

The previous prime is 19225603. The next prime is 19225627. The reversal of 19225609 is 90652291.

It can be written as a sum of positive squares in 3 ways, for example, as 41209 + 19184400 = 203^2 + 4380^2 .

It is not a de Polignac number, because 19225609 - 2¹⁵ = 19192841 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 (19225603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56712 + ... + 57049.

It is an arithmetic number, because the mean of its divisors is an integer number (3469741).

Almost surely, 2^19225609 is an apocalyptic number.

It is an amenable number.

19225609 is a deficient number, since it is larger than the sum of its proper divisors (1592837).

19225609 is a wasteful number, since it uses less digits than its factorization.

19225609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113787 (or 113774 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 19225609 is about 4384.7017002300. The cubic root of 19225609 is about 267.8921792832.

The spelling of 19225609 in words is "nineteen million, two hundred twenty-five thousand, six hundred nine".