172216859 has 8 divisors (see below), whose sum is σ = 174908832. Its totient is φ = 169545600.

The previous prime is 172216843. The next prime is 172216909. The reversal of 172216859 is 958612271.

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 172216859 - 2⁴ = 172216843 is a prime.

It is a super-3 number, since 3×172216859³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172216259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12017 + ... + 22109.

It is an arithmetic number, because the mean of its divisors is an integer number (21863604).

Almost surely, 2^172216859 is an apocalyptic number.

172216859 is a deficient number, since it is larger than the sum of its proper divisors (2691973).

172216859 is a wasteful number, since it uses less digits than its factorization.

172216859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10357.

The product of its digits is 60480, while the sum is 41.

The square root of 172216859 is about 13123.1421161245. The cubic root of 172216859 is about 556.3634028100.

It can be divided in two parts, 1722 and 16859, that added together give a palindrome (18581).

The spelling of 172216859 in words is "one hundred seventy-two million, two hundred sixteen thousand, eight hundred fifty-nine".