135699191 has 2 divisors, whose sum is σ = 135699192. Its totient is φ = 135699190.

The previous prime is 135699173. The next prime is 135699251. The reversal of 135699191 is 191996531.

It is a weak prime.

It is an emirp because it is prime and its reverse (191996531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135699191 - 2⁶ = 135699127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135699131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67849595 + 67849596.

It is an arithmetic number, because the mean of its divisors is an integer number (67849596).

Almost surely, 2^135699191 is an apocalyptic number.

135699191 is a deficient number, since it is larger than the sum of its proper divisors (1).

135699191 is an equidigital number, since it uses as much as digits as its factorization.

135699191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65610, while the sum is 44.

The square root of 135699191 is about 11648.9995707786. Note that the first 3 decimals coincide. The cubic root of 135699191 is about 513.8768889143.

The spelling of 135699191 in words is "one hundred thirty-five million, six hundred ninety-nine thousand, one hundred ninety-one".