135611111 has 4 divisors (see below), whose sum is σ = 135650424. Its totient is φ = 135571800.

The previous prime is 135611107. The next prime is 135611117. The reversal of 135611111 is 111116531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111116531 = 541 ⋅205391.

It is a cyclic number.

It is not a de Polignac number, because 135611111 - 2² = 135611107 is a prime.

It is a Duffinian number.

135611111 is a modest number, since divided by 11111 gives 1356 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135611117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13925 + ... + 21566.

It is an arithmetic number, because the mean of its divisors is an integer number (33912606).

Almost surely, 2^135611111 is an apocalyptic number.

135611111 is a deficient number, since it is larger than the sum of its proper divisors (39313).

135611111 is an equidigital number, since it uses as much as digits as its factorization.

135611111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39312.

The product of its digits is 90, while the sum is 20.

The square root of 135611111 is about 11645.2183749383. The cubic root of 135611111 is about 513.7656819804.

Adding to 135611111 its reverse (111116531), we get a palindrome (246727642).

The spelling of 135611111 in words is "one hundred thirty-five million, six hundred eleven thousand, one hundred eleven".