135487889 has 2 divisors, whose sum is σ = 135487890. Its totient is φ = 135487888.

The previous prime is 135487861. The next prime is 135487907. The reversal of 135487889 is 988784531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73393489 + 62094400 = 8567^2 + 7880^2 .

It is a cyclic number.

It is not a de Polignac number, because 135487889 - 2²⁰ = 134439313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 135487889.

It is not a weakly prime, because it can be changed into another prime (135487589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67743944 + 67743945.

It is an arithmetic number, because the mean of its divisors is an integer number (67743945).

Almost surely, 2^135487889 is an apocalyptic number.

It is an amenable number.

135487889 is a deficient number, since it is larger than the sum of its proper divisors (1).

135487889 is an equidigital number, since it uses as much as digits as its factorization.

135487889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 53.

The square root of 135487889 is about 11639.9265032044. The cubic root of 135487889 is about 513.6100250714.

The spelling of 135487889 in words is "one hundred thirty-five million, four hundred eighty-seven thousand, eight hundred eighty-nine".