135212171 has 4 divisors (see below), whose sum is σ = 138866592. Its totient is φ = 131557752.

The previous prime is 135212159. The next prime is 135212179. The reversal of 135212171 is 171212531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135212171 - 2⁶ = 135212107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135212179) 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, 1827155 + ... + 1827228.

It is an arithmetic number, because the mean of its divisors is an integer number (34716648).

Almost surely, 2^135212171 is an apocalyptic number.

135212171 is a deficient number, since it is larger than the sum of its proper divisors (3654421).

135212171 is an equidigital number, since it uses as much as digits as its factorization.

135212171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654420.

The product of its digits is 420, while the sum is 23.

The square root of 135212171 is about 11628.0768401314. The cubic root of 135212171 is about 513.2613894884.

The spelling of 135212171 in words is "one hundred thirty-five million, two hundred twelve thousand, one hundred seventy-one".