135686693 has 2 divisors, whose sum is σ = 135686694. Its totient is φ = 135686692.

The previous prime is 135686689. The next prime is 135686713. The reversal of 135686693 is 396686531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85248289 + 50438404 = 9233^2 + 7102^2 .

It is an emirp because it is prime and its reverse (396686531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135686693 - 2² = 135686689 is a prime.

It is a super-3 number, since 3×135686693³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135686623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67843346 + 67843347.

It is an arithmetic number, because the mean of its divisors is an integer number (67843347).

Almost surely, 2^135686693 is an apocalyptic number.

It is an amenable number.

135686693 is a deficient number, since it is larger than the sum of its proper divisors (1).

135686693 is an equidigital number, since it uses as much as digits as its factorization.

135686693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 47.

The square root of 135686693 is about 11648.4631175104. The cubic root of 135686693 is about 513.8611122775.

The spelling of 135686693 in words is "one hundred thirty-five million, six hundred eighty-six thousand, six hundred ninety-three".