135721593 has 12 divisors (see below), whose sum is σ = 224048448. Its totient is φ = 77555160.

The previous prime is 135721577. The next prime is 135721601. The reversal of 135721593 is 395127531.

135721593 is a `hidden beast` number, since 1 + 357 + 215 + 93 = 666.

135721593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135721593 - 2⁴ = 135721577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135721493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1077093 + ... + 1077218.

It is an arithmetic number, because the mean of its divisors is an integer number (18670704).

Almost surely, 2^135721593 is an apocalyptic number.

It is an amenable number.

135721593 is a deficient number, since it is larger than the sum of its proper divisors (88326855).

135721593 is a wasteful number, since it uses less digits than its factorization.

135721593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154324 (or 2154321 counting only the distinct ones).

The product of its digits is 28350, while the sum is 36.

The square root of 135721593 is about 11649.9610728963. The cubic root of 135721593 is about 513.9051652721.

The spelling of 135721593 in words is "one hundred thirty-five million, seven hundred twenty-one thousand, five hundred ninety-three".