8321279999 has 4 divisors (see below), whose sum is σ = 8478285336. Its totient is φ = 8164274664.

The previous prime is 8321279971. The next prime is 8321280013. The reversal of 8321279999 is 9999721238.

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

It is a cyclic number.

It is not a de Polignac number, because 8321279999 - 2¹² = 8321275903 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 (8321279929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78502589 + ... + 78502694.

It is an arithmetic number, because the mean of its divisors is an integer number (2119571334).

Almost surely, 2^8321279999 is an apocalyptic number.

8321279999 is a deficient number, since it is larger than the sum of its proper divisors (157005337).

8321279999 is a wasteful number, since it uses less digits than its factorization.

8321279999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157005336.

The product of its digits is 4408992, while the sum is 59.

The square root of 8321279999 is about 91221.0501967611. The cubic root of 8321279999 is about 2026.4227160157.

The spelling of 8321279999 in words is "eight billion, three hundred twenty-one million, two hundred seventy-nine thousand, nine hundred ninety-nine".