135205489 has 4 divisors (see below), whose sum is σ = 135417060. Its totient is φ = 134993920.

The previous prime is 135205481. The next prime is 135205519. The reversal of 135205489 is 984502531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984502531 = 103 ⋅9558277.

It can be written as a sum of positive squares in 2 ways, for example, as 58064400 + 77141089 = 7620^2 + 8783^2 .

It is a cyclic number.

It is not a de Polignac number, because 135205489 - 2³ = 135205481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135205481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104824 + ... + 106105.

It is an arithmetic number, because the mean of its divisors is an integer number (33854265).

Almost surely, 2^135205489 is an apocalyptic number.

It is an amenable number.

135205489 is a deficient number, since it is larger than the sum of its proper divisors (211571).

135205489 is an equidigital number, since it uses as much as digits as its factorization.

135205489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211570.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 135205489 is about 11627.7895147788. The cubic root of 135205489 is about 513.2529344578.

The spelling of 135205489 in words is "one hundred thirty-five million, two hundred five thousand, four hundred eighty-nine".