135581172 has 24 divisors (see below), whose sum is σ = 324907296. Its totient is φ = 43972128.

The previous prime is 135581161. The next prime is 135581179. The reversal of 135581172 is 271185531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135581179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152238 + ... + 153125.

It is an arithmetic number, because the mean of its divisors is an integer number (13537804).

Almost surely, 2^135581172 is an apocalyptic number.

135581172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

135581172 is an abundant number, since it is smaller than the sum of its proper divisors (189326124).

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

135581172 is a wasteful number, since it uses less digits than its factorization.

135581172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305407 (or 305405 counting only the distinct ones).

The product of its digits is 8400, while the sum is 33.

The square root of 135581172 is about 11643.9328407545. The cubic root of 135581172 is about 513.7278710107.

The spelling of 135581172 in words is "one hundred thirty-five million, five hundred eighty-one thousand, one hundred seventy-two".