172981169 has 4 divisors (see below), whose sum is σ = 173859444. Its totient is φ = 172102896.

The previous prime is 172981153. The next prime is 172981181. The reversal of 172981169 is 961189271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77176225 + 95804944 = 8785^2 + 9788^2 .

It is a cyclic number.

It is not a de Polignac number, because 172981169 - 2⁴ = 172981153 is a prime.

It is a super-2 number, since 2×172981169² = 59844969657213122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (172981129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438842 + ... + 439235.

It is an arithmetic number, because the mean of its divisors is an integer number (43464861).

Almost surely, 2^172981169 is an apocalyptic number.

It is an amenable number.

172981169 is a deficient number, since it is larger than the sum of its proper divisors (878275).

172981169 is an equidigital number, since it uses as much as digits as its factorization.

172981169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878274.

The product of its digits is 54432, while the sum is 44.

The square root of 172981169 is about 13152.2305712757. The cubic root of 172981169 is about 557.1852476027.

The spelling of 172981169 in words is "one hundred seventy-two million, nine hundred eighty-one thousand, one hundred sixty-nine".