19100069209 has 9 divisors (see below), whose sum is σ = 20684269119. Its totient is φ = 17629174680.

The previous prime is 19100069203. The next prime is 19100069249. The reversal of 19100069209 is 90296000191.

The square root of 19100069209 is 138203.

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., 2825454025 + 16274615184 = 53155^2 + 127572^2 .

It is not a de Polignac number, because 19100069209 - 2³ = 19100069201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19100069201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1791324 + ... + 1801954.

Almost surely, 2^19100069209 is an apocalyptic number.

19100069209 is the 138203-rd square number.

19100069209 is the 69102-nd centered octagonal number.

It is an amenable number.

19100069209 is a deficient number, since it is larger than the sum of its proper divisors (1584199910).

19100069209 is an frugal number, since it uses more digits than its factorization.

19100069209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21288 (or 10644 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 19100069209 in words is "nineteen billion, one hundred million, sixty-nine thousand, two hundred nine".