135989687 has 2 divisors, whose sum is σ = 135989688. Its totient is φ = 135989686.

The previous prime is 135989683. The next prime is 135989723. The reversal of 135989687 is 786989531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135989687 - 2² = 135989683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135989683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67994843 + 67994844.

It is an arithmetic number, because the mean of its divisors is an integer number (67994844).

Almost surely, 2^135989687 is an apocalyptic number.

135989687 is a deficient number, since it is larger than the sum of its proper divisors (1).

135989687 is an equidigital number, since it uses as much as digits as its factorization.

135989687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 56.

The square root of 135989687 is about 11661.4616150807. The cubic root of 135989687 is about 514.2433189663.

The spelling of 135989687 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, six hundred eighty-seven".