8208921829 has 4 divisors (see below), whose sum is σ = 8343494380. Its totient is φ = 8074349280.

The previous prime is 8208921827. The next prime is 8208921841. The reversal of 8208921829 is 9281298028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4532924929 + 3675996900 = 67327^2 + 60630^2 .

It is a cyclic number.

It is not a de Polignac number, because 8208921829 - 2¹ = 8208921827 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 (8208921827) 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, 67286184 + ... + 67286305.

It is an arithmetic number, because the mean of its divisors is an integer number (2085873595).

Almost surely, 2^8208921829 is an apocalyptic number.

It is an amenable number.

8208921829 is a deficient number, since it is larger than the sum of its proper divisors (134572551).

8208921829 is a wasteful number, since it uses less digits than its factorization.

8208921829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134572550.

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 8208921829 is about 90603.1005484912. The cubic root of 8208921829 is about 2017.2607570037.

The spelling of 8208921829 in words is "eight billion, two hundred eight million, nine hundred twenty-one thousand, eight hundred twenty-nine".