135211881 has 8 divisors (see below), whose sum is σ = 206037184. Its totient is φ = 77263920.

The previous prime is 135211877. The next prime is 135211913. The reversal of 135211881 is 188112531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135211881 - 2² = 135211877 is a prime.

It is a super-3 number, since 3×135211881³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135211981) 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, 3219310 + ... + 3219351.

It is an arithmetic number, because the mean of its divisors is an integer number (25754648).

Almost surely, 2^135211881 is an apocalyptic number.

It is an amenable number.

135211881 is a deficient number, since it is larger than the sum of its proper divisors (70825303).

135211881 is an equidigital number, since it uses as much as digits as its factorization.

135211881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6438671.

The product of its digits is 1920, while the sum is 30.

The square root of 135211881 is about 11628.0643703069. The cubic root of 135211881 is about 513.2610225443.

The spelling of 135211881 in words is "one hundred thirty-five million, two hundred eleven thousand, eight hundred eighty-one".