172525809 has 16 divisors (see below), whose sum is σ = 246654720. Its totient is φ = 106878720.

The previous prime is 172525799. The next prime is 172525813. The reversal of 172525809 is 908525271.

It is not a de Polignac number, because 172525809 - 2¹³ = 172517617 is a prime.

It is a super-2 number, since 2×172525809² = 59530309542208962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172525879) 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, 17382 + ... + 25439.

It is an arithmetic number, because the mean of its divisors is an integer number (15415920).

Almost surely, 2^172525809 is an apocalyptic number.

It is an amenable number.

172525809 is a deficient number, since it is larger than the sum of its proper divisors (74128911).

172525809 is a wasteful number, since it uses less digits than its factorization.

172525809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42920.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 172525809 is about 13134.9080316537. The cubic root of 172525809 is about 556.6959017877.

The spelling of 172525809 in words is "one hundred seventy-two million, five hundred twenty-five thousand, eight hundred nine".