135817985 has 16 divisors (see below), whose sum is σ = 173740800. Its totient is φ = 101627136.

The previous prime is 135817961. The next prime is 135817987. The reversal of 135817985 is 589718531.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 135817985 - 2⁸ = 135817729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135817987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1544 + ... + 16553.

It is an arithmetic number, because the mean of its divisors is an integer number (10858800).

Almost surely, 2^135817985 is an apocalyptic number.

It is an amenable number.

135817985 is a deficient number, since it is larger than the sum of its proper divisors (37922815).

135817985 is a wasteful number, since it uses less digits than its factorization.

135817985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18200.

The product of its digits is 302400, while the sum is 47.

The square root of 135817985 is about 11654.0973481433. The cubic root of 135817985 is about 514.0267981506.

The spelling of 135817985 in words is "one hundred thirty-five million, eight hundred seventeen thousand, nine hundred eighty-five".