172044161 has 4 divisors (see below), whose sum is σ = 176045232. Its totient is φ = 168043092.

The previous prime is 172044151. The next prime is 172044167. The reversal of 172044161 is 161440271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172044161 - 2²⁶ = 104935297 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 172044161.

It is not an unprimeable number, because it can be changed into a prime (172044167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000471 + ... + 2000556.

It is an arithmetic number, because the mean of its divisors is an integer number (44011308).

Almost surely, 2^172044161 is an apocalyptic number.

It is an amenable number.

172044161 is a deficient number, since it is larger than the sum of its proper divisors (4001071).

172044161 is an equidigital number, since it uses as much as digits as its factorization.

172044161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001070.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 172044161 is about 13116.5605628915. The cubic root of 172044161 is about 556.1773680194.

The spelling of 172044161 in words is "one hundred seventy-two million, forty-four thousand, one hundred sixty-one".