135218881 has 12 divisors (see below), whose sum is σ = 157489860. Its totient is φ = 115758720.

The previous prime is 135218827. The next prime is 135218887. The reversal of 135218881 is 188812531.

It can be written as a sum of positive squares in 2 ways, for example, as 122323600 + 12895281 = 11060^2 + 3591^2 .

It is not a de Polignac number, because 135218881 - 2⁷ = 135218753 is a prime.

It is a super-2 number, since 2×135218881² = 36568291557784322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135218881.

It is not an unprimeable number, because it can be changed into a prime (135218887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63685 + ... + 65773.

It is an arithmetic number, because the mean of its divisors is an integer number (13124155).

Almost surely, 2^135218881 is an apocalyptic number.

It is an amenable number.

135218881 is a deficient number, since it is larger than the sum of its proper divisors (22270979).

135218881 is a wasteful number, since it uses less digits than its factorization.

135218881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424 (or 3417 counting only the distinct ones).

The product of its digits is 15360, while the sum is 37.

The square root of 135218881 is about 11628.3653623370. The cubic root of 135218881 is about 513.2698796682.

The spelling of 135218881 in words is "one hundred thirty-five million, two hundred eighteen thousand, eight hundred eighty-one".