135120091 has 2 divisors, whose sum is σ = 135120092. Its totient is φ = 135120090.

The previous prime is 135120079. The next prime is 135120109. The reversal of 135120091 is 190021531.

Together with next prime (135120109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135120091 - 2⁵ = 135120059 is a prime.

It is not a weakly prime, because it can be changed into another prime (135120031) 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, 67560045 + 67560046.

It is an arithmetic number, because the mean of its divisors is an integer number (67560046).

Almost surely, 2^135120091 is an apocalyptic number.

135120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

135120091 is an equidigital number, since it uses as much as digits as its factorization.

135120091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 135120091 is about 11624.1167836529. The cubic root of 135120091 is about 513.1448520475.

The spelling of 135120091 in words is "one hundred thirty-five million, one hundred twenty thousand, ninety-one".