172171243 has 4 divisors (see below), whose sum is σ = 172225408. Its totient is φ = 172117080.

The previous prime is 172171213. The next prime is 172171253. The reversal of 172171243 is 342171271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342171271 = 13 ⋅26320867.

It is a cyclic number.

It is not a de Polignac number, because 172171243 - 2⁵ = 172171211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172171213) 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, 21996 + ... + 28777.

It is an arithmetic number, because the mean of its divisors is an integer number (43056352).

Almost surely, 2^172171243 is an apocalyptic number.

172171243 is a deficient number, since it is larger than the sum of its proper divisors (54165).

172171243 is an equidigital number, since it uses as much as digits as its factorization.

172171243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54164.

The product of its digits is 2352, while the sum is 28.

The square root of 172171243 is about 13121.4040026211. The cubic root of 172171243 is about 556.3142761562.

Adding to 172171243 its sum of digits (28), we get a palindrome (172171271).

The spelling of 172171243 in words is "one hundred seventy-two million, one hundred seventy-one thousand, two hundred forty-three".