8517221723 has 8 divisors (see below), whose sum is σ = 8566080768. Its totient is φ = 8468501184.

The previous prime is 8517221693. The next prime is 8517221743. The reversal of 8517221723 is 3271227158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8517221723 - 2¹⁶ = 8517156187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8517221743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89990 + ... + 158532.

It is an arithmetic number, because the mean of its divisors is an integer number (1070760096).

Almost surely, 2^8517221723 is an apocalyptic number.

8517221723 is a deficient number, since it is larger than the sum of its proper divisors (48859045).

8517221723 is a wasteful number, since it uses less digits than its factorization.

8517221723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69253.

The product of its digits is 47040, while the sum is 38.

The square root of 8517221723 is about 92288.7952191381. The cubic root of 8517221723 is about 2042.2049178924.

The spelling of 8517221723 in words is "eight billion, five hundred seventeen million, two hundred twenty-one thousand, seven hundred twenty-three".