135681111 has 24 divisors (see below), whose sum is σ = 203308560. Its totient is φ = 87091200.

The previous prime is 135681107. The next prime is 135681137. The reversal of 135681111 is 111186531.

It is a happy number.

It is not a de Polignac number, because 135681111 - 2² = 135681107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135681191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166896 + ... + 167706.

It is an arithmetic number, because the mean of its divisors is an integer number (8471190).

Almost surely, 2^135681111 is an apocalyptic number.

135681111 is a deficient number, since it is larger than the sum of its proper divisors (67627449).

135681111 is a wasteful number, since it uses less digits than its factorization.

135681111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1484 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 135681111 is about 11648.2235126220. The cubic root of 135681111 is about 513.8540656222.

The spelling of 135681111 in words is "one hundred thirty-five million, six hundred eighty-one thousand, one hundred eleven".