135085987 has 4 divisors (see below), whose sum is σ = 137375640. Its totient is φ = 132796336.

The previous prime is 135085981. The next prime is 135085997. The reversal of 135085987 is 789580531.

135085987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789580531 = 197 ⋅4008023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135085987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135085981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1144738 + ... + 1144855.

It is an arithmetic number, because the mean of its divisors is an integer number (34343910).

Almost surely, 2^135085987 is an apocalyptic number.

135085987 is a deficient number, since it is larger than the sum of its proper divisors (2289653).

135085987 is an equidigital number, since it uses as much as digits as its factorization.

135085987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289652.

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 135085987 is about 11622.6497409154. The cubic root of 135085987 is about 513.1016762216.

The spelling of 135085987 in words is "one hundred thirty-five million, eighty-five thousand, nine hundred eighty-seven".