172117847 has 8 divisors (see below), whose sum is σ = 190028160. Its totient is φ = 154584760.

The previous prime is 172117831. The next prime is 172117849. The reversal of 172117847 is 748711271.

172117847 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 172117847 - 2⁴ = 172117831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172117847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172117849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93347 + ... + 95172.

It is an arithmetic number, because the mean of its divisors is an integer number (23753520).

Almost surely, 2^172117847 is an apocalyptic number.

172117847 is a deficient number, since it is larger than the sum of its proper divisors (17910313).

172117847 is a wasteful number, since it uses less digits than its factorization.

172117847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188613.

The product of its digits is 21952, while the sum is 38.

The square root of 172117847 is about 13119.3691540409. The cubic root of 172117847 is about 556.2567597209.

The spelling of 172117847 in words is "one hundred seventy-two million, one hundred seventeen thousand, eight hundred forty-seven".