135500989 has 18 divisors (see below), whose sum is σ = 154924506. Its totient is φ = 118441440.

The previous prime is 135500927. The next prime is 135501007. The reversal of 135500989 is 989005531.

It can be written as a sum of positive squares in 3 ways, for example, as 1172889 + 134328100 = 1083^2 + 11590^2 .

It is a de Polignac number, because none of the positive numbers 2^k-135500989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135500909) 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 17 ways as a sum of consecutive naturals, for example, 59899 + ... + 62119.

It is an arithmetic number, because the mean of its divisors is an integer number (8606917).

Almost surely, 2^135500989 is an apocalyptic number.

135500989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

135500989 is a deficient number, since it is larger than the sum of its proper divisors (19423517).

135500989 is a wasteful number, since it uses less digits than its factorization.

135500989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285 (or 2253 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 135500989 is about 11640.4892079328. The cubic root of 135500989 is about 513.6265777796.

The spelling of 135500989 in words is "one hundred thirty-five million, five hundred thousand, nine hundred eighty-nine".