135989671 has 4 divisors (see below), whose sum is σ = 140679000. Its totient is φ = 131300344.

The previous prime is 135989657. The next prime is 135989683. The reversal of 135989671 is 176989531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176989531 = 23 ⋅7695197.

It is a cyclic number.

It is not a de Polignac number, because 135989671 - 2¹⁵ = 135956903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135989071) 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, 2344621 + ... + 2344678.

It is an arithmetic number, because the mean of its divisors is an integer number (35169750).

Almost surely, 2^135989671 is an apocalyptic number.

135989671 is a deficient number, since it is larger than the sum of its proper divisors (4689329).

135989671 is an equidigital number, since it uses as much as digits as its factorization.

135989671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689328.

The product of its digits is 408240, while the sum is 49.

The square root of 135989671 is about 11661.4609290603. The cubic root of 135989671 is about 514.2432987983.

The spelling of 135989671 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, six hundred seventy-one".