135688889 has 12 divisors (see below), whose sum is σ = 158097024. Its totient is φ = 116117064.

The previous prime is 135688877. The next prime is 135688897. The reversal of 135688889 is 988886531.

It is not a de Polignac number, because 135688889 - 2⁴ = 135688873 is a prime.

It is a super-2 number, since 2×135688889² = 36822949196108642, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (135682889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34544 + ... + 38270.

It is an arithmetic number, because the mean of its divisors is an integer number (13174752).

Almost surely, 2^135688889 is an apocalyptic number.

It is an amenable number.

135688889 is a deficient number, since it is larger than the sum of its proper divisors (22408135).

135688889 is an equidigital number, since it uses as much as digits as its factorization.

135688889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484 (or 4477 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 56.

The square root of 135688889 is about 11648.5573784911. The cubic root of 135688889 is about 513.8638844307.

The spelling of 135688889 in words is "one hundred thirty-five million, six hundred eighty-eight thousand, eight hundred eighty-nine".