135989983 has 2 divisors, whose sum is σ = 135989984. Its totient is φ = 135989982.

The previous prime is 135989981. The next prime is 135990013. The reversal of 135989983 is 389989531.

135989983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135989983 - 2¹ = 135989981 is a prime.

Together with 135989981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135989981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67994991 + 67994992.

It is an arithmetic number, because the mean of its divisors is an integer number (67994992).

Almost surely, 2^135989983 is an apocalyptic number.

135989983 is a deficient number, since it is larger than the sum of its proper divisors (1).

135989983 is an equidigital number, since it uses as much as digits as its factorization.

135989983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 55.

The square root of 135989983 is about 11661.4743064503. The cubic root of 135989983 is about 514.2436920728.

The spelling of 135989983 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, nine hundred eighty-three".