135361881 has 16 divisors (see below), whose sum is σ = 201888000. Its totient is φ = 89632944.

The previous prime is 135361861. The next prime is 135361913. The reversal of 135361881 is 188163531.

135361881 is a `hidden beast` number, since 1 + 35 + 3 + 618 + 8 + 1 = 666.

It is not a de Polignac number, because 135361881 - 2¹⁵ = 135329113 is a prime.

It is a super-2 number, since 2×135361881² = 36645677655716322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135361801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12801 + ... + 20846.

It is an arithmetic number, because the mean of its divisors is an integer number (12618000).

Almost surely, 2^135361881 is an apocalyptic number.

It is an amenable number.

135361881 is a deficient number, since it is larger than the sum of its proper divisors (66526119).

135361881 is a wasteful number, since it uses less digits than its factorization.

135361881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33805 (or 33799 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 135361881 is about 11634.5124951585. The cubic root of 135361881 is about 513.4507511898.

The spelling of 135361881 in words is "one hundred thirty-five million, three hundred sixty-one thousand, eight hundred eighty-one".