172136509 has 8 divisors (see below), whose sum is σ = 182528640. Its totient is φ = 161774016.

The previous prime is 172136479. The next prime is 172136533. The reversal of 172136509 is 905631271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172136509 - 2⁵ = 172136477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172136539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5182 + ... + 19264.

It is an arithmetic number, because the mean of its divisors is an integer number (22816080).

Almost surely, 2^172136509 is an apocalyptic number.

It is an amenable number.

172136509 is a deficient number, since it is larger than the sum of its proper divisors (10392131).

172136509 is a wasteful number, since it uses less digits than its factorization.

172136509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14819.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 172136509 is about 13120.0803732294. The cubic root of 172136509 is about 556.2768631726.

The spelling of 172136509 in words is "one hundred seventy-two million, one hundred thirty-six thousand, five hundred nine".