135875989 has 2 divisors, whose sum is σ = 135875990. Its totient is φ = 135875988.

The previous prime is 135875981. The next prime is 135876031. The reversal of 135875989 is 989578531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121925764 + 13950225 = 11042^2 + 3735^2 .

It is an emirp because it is prime and its reverse (989578531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135875989 - 2³ = 135875981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135875981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67937994 + 67937995.

It is an arithmetic number, because the mean of its divisors is an integer number (67937995).

Almost surely, 2^135875989 is an apocalyptic number.

It is an amenable number.

135875989 is a deficient number, since it is larger than the sum of its proper divisors (1).

135875989 is an equidigital number, since it uses as much as digits as its factorization.

135875989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 55.

The square root of 135875989 is about 11656.5856493229. The cubic root of 135875989 is about 514.0999631465.

The spelling of 135875989 in words is "one hundred thirty-five million, eight hundred seventy-five thousand, nine hundred eighty-nine".