135449989 has 4 divisors (see below), whose sum is σ = 136791180. Its totient is φ = 134108800.

The previous prime is 135449987. The next prime is 135450001. The reversal of 135449989 is 989944531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989944531 = 101 ⋅9801431.

It can be written as a sum of positive squares in 2 ways, for example, as 84327489 + 51122500 = 9183^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 135449989 - 2¹ = 135449987 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 (135449987) 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, 670444 + ... + 670645.

It is an arithmetic number, because the mean of its divisors is an integer number (34197795).

Almost surely, 2^135449989 is an apocalyptic number.

It is an amenable number.

135449989 is a deficient number, since it is larger than the sum of its proper divisors (1341191).

135449989 is a wasteful number, since it uses less digits than its factorization.

135449989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341190.

The product of its digits is 1399680, while the sum is 52.

The square root of 135449989 is about 11638.2983721848. The cubic root of 135449989 is about 513.5621299288.

The spelling of 135449989 in words is "one hundred thirty-five million, four hundred forty-nine thousand, nine hundred eighty-nine".