999814008649 has 3 divisors (see below), whose sum is σ = 999815008557. Its totient is φ = 999813008742.

The previous prime is 999814008619. The next prime is 999814008709. The reversal of 999814008649 is 946800418999.

The square root of 999814008649 is 999907.

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

999814008649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 946800418999 = 71 ⋅13335217169.

It is not a de Polignac number, because 999814008649 - 2⁵ = 999814008617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999814008619) 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, 499954 + ... + 1499860.

It is an arithmetic number, because the mean of its divisors is an integer number (333271669519).

Almost surely, 2^999814008649 is an apocalyptic number.

999814008649 is the 999907-th square number.

999814008649 is the 499954-th centered octagonal number.

It is an amenable number.

999814008649 is a deficient number, since it is larger than the sum of its proper divisors (999908).

999814008649 is an frugal number, since it uses more digits than its factorization.

999814008649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999814 (or 999907 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 67.

The spelling of 999814008649 in words is "nine hundred ninety-nine billion, eight hundred fourteen million, eight thousand, six hundred forty-nine".