19149349744009 has 3 divisors (see below), whose sum is σ = 19149354120007. Its totient is φ = 19149345368012.

The previous prime is 19149349743991. The next prime is 19149349744013. The reversal of 19149349744009 is 90044794394191.

The square root of 19149349744009 is 4375997.

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.

It can be written as a sum of positive squares in only one way, i.e., 1087087743225 + 18062262000784 = 1042635^2 + 4249972^2 .

It is not a de Polignac number, because 19149349744009 - 2²⁷ = 19149215526281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19149349744069) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2187999 + ... + 6563995.

Almost surely, 2^{19149349744009} is an apocalyptic number.

19149349744009 is the 4375997-th square number.

19149349744009 is the 2187999-th centered octagonal number.

It is an amenable number.

19149349744009 is a deficient number, since it is larger than the sum of its proper divisors (4375998).

19149349744009 is an frugal number, since it uses more digits than its factorization.

19149349744009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751994 (or 4375997 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 19149349744009 in words is "nineteen trillion, one hundred forty-nine billion, three hundred forty-nine million, seven hundred forty-four thousand, nine".