2194685213809 has 9 divisors (see below), whose sum is σ = 2412357857931. Its totient is φ = 1995153561720.

The previous prime is 2194685213801. The next prime is 2194685213821. The reversal of 2194685213809 is 9083125864912.

It is a happy number.

The square root of 2194685213809 is 1481447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1919928928225 + 274756285584 = 1385615^2 + 524172^2 .

It is not a de Polignac number, because 2194685213809 - 2³ = 2194685213801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2194685213801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16228579 + ... + 16363255.

Almost surely, 2^{2194685213809} is an apocalyptic number.

2194685213809 is the 1481447-th square number.

2194685213809 is the 740724-th centered octagonal number.

It is an amenable number.

2194685213809 is a deficient number, since it is larger than the sum of its proper divisors (217672644122).

2194685213809 is an frugal number, since it uses more digits than its factorization.

2194685213809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269376 (or 134688 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 2194685213809 in words is "two trillion, one hundred ninety-four billion, six hundred eighty-five million, two hundred thirteen thousand, eight hundred nine".