172135523 has 16 divisors (see below), whose sum is σ = 210651840. Its totient is φ = 137296896.

The previous prime is 172135517. The next prime is 172135541. The reversal of 172135523 is 325531271.

It is not a de Polignac number, because 172135523 - 2¹⁰ = 172134499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172135543) 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, 2465 + ... + 18717.

It is an arithmetic number, because the mean of its divisors is an integer number (13165740).

Almost surely, 2^172135523 is an apocalyptic number.

172135523 is a deficient number, since it is larger than the sum of its proper divisors (38516317).

172135523 is a wasteful number, since it uses less digits than its factorization.

172135523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16366.

The product of its digits is 6300, while the sum is 29.

The square root of 172135523 is about 13120.0427971863. The cubic root of 172135523 is about 556.2758010504.

Adding to 172135523 its reverse (325531271), we get a palindrome (497666794).

The spelling of 172135523 in words is "one hundred seventy-two million, one hundred thirty-five thousand, five hundred twenty-three".