19264607209 has 3 divisors (see below), whose sum is σ = 19264746007. Its totient is φ = 19264468412.

The previous prime is 19264607207. The next prime is 19264607221. The reversal of 19264607209 is 90270646291.

The square root of 19264607209 is 138797.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90270646291 = 7 ⋅12895806613.

It can be written as a sum of positive squares in only one way, i.e., 18628155225 + 636451984 = 136485^2 + 25228^2 .

It is not a de Polignac number, because 19264607209 - 2¹ = 19264607207 is a prime.

It is a super-2 number, since 2×19264607209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19264607207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 69399 + ... + 208195.

Almost surely, 2^19264607209 is an apocalyptic number.

19264607209 is the 138797-th square number.

19264607209 is the 69399-th centered octagonal number.

It is an amenable number.

19264607209 is a deficient number, since it is larger than the sum of its proper divisors (138798).

19264607209 is an frugal number, since it uses more digits than its factorization.

19264607209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277594 (or 138797 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 19264607209 in words is "nineteen billion, two hundred sixty-four million, six hundred seven thousand, two hundred nine".