8209999949 has 4 divisors (see below), whose sum is σ = 8211795936. Its totient is φ = 8208203964.

The previous prime is 8209999829. The next prime is 8209999961. The reversal of 8209999949 is 9499999028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8209999949 - 2¹² = 8209995853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8209999349) 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 3 ways as a sum of consecutive naturals, for example, 891119 + ... + 900284.

It is an arithmetic number, because the mean of its divisors is an integer number (2052948984).

Almost surely, 2^8209999949 is an apocalyptic number.

It is an amenable number.

8209999949 is a deficient number, since it is larger than the sum of its proper divisors (1795987).

8209999949 is a wasteful number, since it uses less digits than its factorization.

8209999949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795986.

The product of its (nonzero) digits is 34012224, while the sum is 68.

The square root of 8209999949 is about 90609.0500391655. The cubic root of 8209999949 is about 2017.3490655542.

The spelling of 8209999949 in words is "eight billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred forty-nine".