135636989 has 8 divisors (see below), whose sum is σ = 136576440. Its totient is φ = 134701056.

The previous prime is 135636967. The next prime is 135637001. The reversal of 135636989 is 989636531.

It can be written as a sum of positive squares in 4 ways, for example, as 7562500 + 128074489 = 2750^2 + 11317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135636989 - 2²⁰ = 134588413 is a prime.

It is a super-2 number, since 2×135636989² = 36794785569972242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135635989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175997 + ... + 176765.

It is an arithmetic number, because the mean of its divisors is an integer number (17072055).

Almost surely, 2^135636989 is an apocalyptic number.

It is an amenable number.

135636989 is a deficient number, since it is larger than the sum of its proper divisors (939451).

135636989 is an equidigital number, since it uses as much as digits as its factorization.

135636989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

The product of its digits is 1049760, while the sum is 50.

The square root of 135636989 is about 11646.3294217534. The cubic root of 135636989 is about 513.7983596929.

The spelling of 135636989 in words is "one hundred thirty-five million, six hundred thirty-six thousand, nine hundred eighty-nine".