135698639 has 2 divisors, whose sum is σ = 135698640. Its totient is φ = 135698638.

The previous prime is 135698599. The next prime is 135698653. The reversal of 135698639 is 936896531.

It is a strong prime.

It is an emirp because it is prime and its reverse (936896531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135698639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135698659) 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, 67849319 + 67849320.

It is an arithmetic number, because the mean of its divisors is an integer number (67849320).

Almost surely, 2^135698639 is an apocalyptic number.

135698639 is a deficient number, since it is larger than the sum of its proper divisors (1).

135698639 is an equidigital number, since it uses as much as digits as its factorization.

135698639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 50.

The square root of 135698639 is about 11648.9758777328. The cubic root of 135698639 is about 513.8761921270.

The spelling of 135698639 in words is "one hundred thirty-five million, six hundred ninety-eight thousand, six hundred thirty-nine".