135686601 has 6 divisors (see below), whose sum is σ = 195991770. Its totient is φ = 90457728.

The previous prime is 135686567. The next prime is 135686611. The reversal of 135686601 is 106686531.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 132227001 + 3459600 = 11499^2 + 1860^2 .

It is not a de Polignac number, because 135686601 - 2¹¹ = 135684553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135686611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7538136 + ... + 7538153.

It is an arithmetic number, because the mean of its divisors is an integer number (32665295).

Almost surely, 2^135686601 is an apocalyptic number.

It is an amenable number.

135686601 is a deficient number, since it is larger than the sum of its proper divisors (60305169).

135686601 is a wasteful number, since it uses less digits than its factorization.

135686601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15076295 (or 15076292 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 135686601 is about 11648.4591684909. The cubic root of 135686601 is about 513.8609961393.

The spelling of 135686601 in words is "one hundred thirty-five million, six hundred eighty-six thousand, six hundred one".