135216523 has 4 divisors (see below), whose sum is σ = 145617808. Its totient is φ = 124815240.

The previous prime is 135216511. The next prime is 135216527. The reversal of 135216523 is 325612531.

135216523 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 135216523 - 2⁵ = 135216491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135216491 and 135216500.

It is not an unprimeable number, because it can be changed into a prime (135216527) 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, 5200623 + ... + 5200648.

It is an arithmetic number, because the mean of its divisors is an integer number (36404452).

Almost surely, 2^135216523 is an apocalyptic number.

135216523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

135216523 is a deficient number, since it is larger than the sum of its proper divisors (10401285).

135216523 is a wasteful number, since it uses less digits than its factorization.

135216523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10401284.

The product of its digits is 5400, while the sum is 28.

The square root of 135216523 is about 11628.2639718919. The cubic root of 135216523 is about 513.2668961169.

The spelling of 135216523 in words is "one hundred thirty-five million, two hundred sixteen thousand, five hundred twenty-three".