135221166 has 24 divisors (see below), whose sum is σ = 293346144. Its totient is φ = 45017280.

The previous prime is 135221153. The next prime is 135221173. The reversal of 135221166 is 661122531.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11595 + ... + 20121.

It is an arithmetic number, because the mean of its divisors is an integer number (12222756).

Almost surely, 2^135221166 is an apocalyptic number.

135221166 is an abundant number, since it is smaller than the sum of its proper divisors (158124978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135221166 is a wasteful number, since it uses less digits than its factorization.

135221166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9416 (or 9413 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 135221166 is about 11628.4636130488. The cubic root of 135221166 is about 513.2727708204.

Adding to 135221166 its reverse (661122531), we get a palindrome (796343697).

The spelling of 135221166 in words is "one hundred thirty-five million, two hundred twenty-one thousand, one hundred sixty-six".