135659989 has 2 divisors, whose sum is σ = 135659990. Its totient is φ = 135659988.

The previous prime is 135659971. The next prime is 135660067. The reversal of 135659989 is 989956531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129618225 + 6041764 = 11385^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 135659989 - 2⁷ = 135659861 is a prime.

It is a super-3 number, since 3×135659989³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135659959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67829994 + 67829995.

It is an arithmetic number, because the mean of its divisors is an integer number (67829995).

Almost surely, 2^135659989 is an apocalyptic number.

It is an amenable number.

135659989 is a deficient number, since it is larger than the sum of its proper divisors (1).

135659989 is an equidigital number, since it uses as much as digits as its factorization.

135659989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2624400, while the sum is 55.

The square root of 135659989 is about 11647.3168154730. The cubic root of 135659989 is about 513.8273996927.

The spelling of 135659989 in words is "one hundred thirty-five million, six hundred fifty-nine thousand, nine hundred eighty-nine".