172135605 has 8 divisors (see below), whose sum is σ = 275416992. Its totient is φ = 91805648.

The previous prime is 172135603. The next prime is 172135631. The reversal of 172135605 is 506531271.

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 172135605 - 2¹ = 172135603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172135603) 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, 5737839 + ... + 5737868.

It is an arithmetic number, because the mean of its divisors is an integer number (34427124).

Almost surely, 2^172135605 is an apocalyptic number.

172135605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172135605 is a deficient number, since it is larger than the sum of its proper divisors (103281387).

172135605 is a wasteful number, since it uses less digits than its factorization.

172135605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11475715.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 172135605 is about 13120.0459221757. The cubic root of 172135605 is about 556.2758893812.

Adding to 172135605 its reverse (506531271), we get a palindrome (678666876).

The spelling of 172135605 in words is "one hundred seventy-two million, one hundred thirty-five thousand, six hundred five".