172105285 has 16 divisors (see below), whose sum is σ = 233072640. Its totient is φ = 120850240.

The previous prime is 172105277. The next prime is 172105289. The reversal of 172105285 is 582501271.

It is not a de Polignac number, because 172105285 - 2³ = 172105277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172105289) 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 15 ways as a sum of consecutive naturals, for example, 52357 + ... + 55546.

It is an arithmetic number, because the mean of its divisors is an integer number (14567040).

Almost surely, 2^172105285 is an apocalyptic number.

It is an amenable number.

172105285 is a deficient number, since it is larger than the sum of its proper divisors (60967355).

172105285 is a wasteful number, since it uses less digits than its factorization.

172105285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107948.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 172105285 is about 13118.8903875290. The cubic root of 172105285 is about 556.2432266145.

The spelling of 172105285 in words is "one hundred seventy-two million, one hundred five thousand, two hundred eighty-five".