172055689 has 9 divisors (see below), whose sum is σ = 186493653. Its totient is φ = 158663232.

The previous prime is 172055669. The next prime is 172055701. The reversal of 172055689 is 986550271.

The square root of 172055689 is 13117.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 53071225 + 118984464 = 7285^2 + 10908^2 .

It is not a de Polignac number, because 172055689 - 2²⁵ = 138501257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172055669) 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 8 ways as a sum of consecutive naturals, for example, 170017 + ... + 171025.

It is an arithmetic number, because the mean of its divisors is an integer number (20721517).

Almost surely, 2^172055689 is an apocalyptic number.

172055689 is the 13117-th square number.

172055689 is the 6559-th centered octagonal number.

It is an amenable number.

172055689 is a deficient number, since it is larger than the sum of its proper divisors (14437964).

172055689 is an frugal number, since it uses more digits than its factorization.

172055689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The cubic root of 172055689 is about 556.1897901585.

The spelling of 172055689 in words is "one hundred seventy-two million, fifty-five thousand, six hundred eighty-nine".