135420191 has 2 divisors, whose sum is σ = 135420192. Its totient is φ = 135420190.

The previous prime is 135420179. The next prime is 135420209. The reversal of 135420191 is 191024531.

It is a weak prime.

It is an emirp because it is prime and its reverse (191024531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135420191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135420191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135420101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67710095 + 67710096.

It is an arithmetic number, because the mean of its divisors is an integer number (67710096).

Almost surely, 2^135420191 is an apocalyptic number.

135420191 is a deficient number, since it is larger than the sum of its proper divisors (1).

135420191 is an equidigital number, since it uses as much as digits as its factorization.

135420191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 135420191 is about 11637.0181318068. The cubic root of 135420191 is about 513.5244672047.

The spelling of 135420191 in words is "one hundred thirty-five million, four hundred twenty thousand, one hundred ninety-one".