135635989 has 2 divisors, whose sum is σ = 135635990. Its totient is φ = 135635988.

The previous prime is 135635963. The next prime is 135636023. The reversal of 135635989 is 989536531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113592964 + 22043025 = 10658^2 + 4695^2 .

It is a cyclic number.

It is not a de Polignac number, because 135635989 - 2¹³ = 135627797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135635909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67817994 + 67817995.

It is an arithmetic number, because the mean of its divisors is an integer number (67817995).

Almost surely, 2^135635989 is an apocalyptic number.

It is an amenable number.

135635989 is a deficient number, since it is larger than the sum of its proper divisors (1).

135635989 is an equidigital number, since it uses as much as digits as its factorization.

135635989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 49.

The square root of 135635989 is about 11646.2864896928. The cubic root of 135635989 is about 513.7970970098.

The spelling of 135635989 in words is "one hundred thirty-five million, six hundred thirty-five thousand, nine hundred eighty-nine".