135620091 has 12 divisors (see below), whose sum is σ = 198256968. Its totient is φ = 89323584.

The previous prime is 135620077. The next prime is 135620113. The reversal of 135620091 is 190026531.

135620091 is a `hidden beast` number, since 1 + 35 + 620 + 0 + 9 + 1 = 666.

It is not a de Polignac number, because 135620091 - 2⁶ = 135620027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135620021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90030 + ... + 91523.

It is an arithmetic number, because the mean of its divisors is an integer number (16521414).

Almost surely, 2^135620091 is an apocalyptic number.

135620091 is a deficient number, since it is larger than the sum of its proper divisors (62636877).

135620091 is a wasteful number, since it uses less digits than its factorization.

135620091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181642 (or 181639 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 135620091 is about 11645.6039345325. The cubic root of 135620091 is about 513.7770220394. Note that the first 3 decimals are identical.

The spelling of 135620091 in words is "one hundred thirty-five million, six hundred twenty thousand, ninety-one".