172520289 has 12 divisors (see below), whose sum is σ = 249542800. Its totient is φ = 114853464.

The previous prime is 172520287. The next prime is 172520311. The reversal of 172520289 is 982025271.

It is not a de Polignac number, because 172520289 - 2¹ = 172520287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172520281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6319 + ... + 19620.

Almost surely, 2^172520289 is an apocalyptic number.

It is an amenable number.

172520289 is a deficient number, since it is larger than the sum of its proper divisors (77022511).

172520289 is a wasteful number, since it uses less digits than its factorization.

172520289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26684 (or 26681 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 172520289 is about 13134.6979028830. The cubic root of 172520289 is about 556.6899645231.

The spelling of 172520289 in words is "one hundred seventy-two million, five hundred twenty thousand, two hundred eighty-nine".