135291173 has 4 divisors (see below), whose sum is σ = 135522240. Its totient is φ = 135060108.

The previous prime is 135291137. The next prime is 135291193. The reversal of 135291173 is 371192531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135291173 - 2⁶ = 135291109 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 (135291113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114653 + ... + 115826.

It is an arithmetic number, because the mean of its divisors is an integer number (33880560).

Almost surely, 2^135291173 is an apocalyptic number.

It is an amenable number.

135291173 is a deficient number, since it is larger than the sum of its proper divisors (231067).

135291173 is an equidigital number, since it uses as much as digits as its factorization.

135291173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231066.

The product of its digits is 5670, while the sum is 32.

The square root of 135291173 is about 11631.4733804450. The cubic root of 135291173 is about 513.3613331085.

The spelling of 135291173 in words is "one hundred thirty-five million, two hundred ninety-one thousand, one hundred seventy-three".