135123911 has 4 divisors (see below), whose sum is σ = 145518072. Its totient is φ = 124729752.

The previous prime is 135123907. The next prime is 135123913. The reversal of 135123911 is 119321531.

135123911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135123911 - 2² = 135123907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135123913) 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, 5197061 + ... + 5197086.

It is an arithmetic number, because the mean of its divisors is an integer number (36379518).

Almost surely, 2^135123911 is an apocalyptic number.

135123911 is a deficient number, since it is larger than the sum of its proper divisors (10394161).

135123911 is a wasteful number, since it uses less digits than its factorization.

135123911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10394160.

The product of its digits is 810, while the sum is 26.

The square root of 135123911 is about 11624.2810960506. The cubic root of 135123911 is about 513.1496877332.

The spelling of 135123911 in words is "one hundred thirty-five million, one hundred twenty-three thousand, nine hundred eleven".