172923171 has 4 divisors (see below), whose sum is σ = 230564232. Its totient is φ = 115282112.

The previous prime is 172923169. The next prime is 172923193. The reversal of 172923171 is 171329271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171329271 = 3 ⋅57109757.

It is a cyclic number.

It is not a de Polignac number, because 172923171 - 2¹ = 172923169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172923071) 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 3 ways as a sum of consecutive naturals, for example, 28820526 + ... + 28820531.

It is an arithmetic number, because the mean of its divisors is an integer number (57641058).

Almost surely, 2^172923171 is an apocalyptic number.

172923171 is a deficient number, since it is larger than the sum of its proper divisors (57641061).

172923171 is an equidigital number, since it uses as much as digits as its factorization.

172923171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57641060.

The product of its digits is 5292, while the sum is 33.

The square root of 172923171 is about 13150.0255132832. The cubic root of 172923171 is about 557.1229686805.

The spelling of 172923171 in words is "one hundred seventy-two million, nine hundred twenty-three thousand, one hundred seventy-one".