135359991 has 60 divisors (see below), whose sum is σ = 228574808. Its totient is φ = 79676784.

The previous prime is 135359989. The next prime is 135360019. The reversal of 135359991 is 199953531.

It is a happy number.

135359991 is a `hidden beast` number, since 1 + 3 + 53 + 599 + 9 + 1 = 666.

It is not a de Polignac number, because 135359991 - 2¹ = 135359989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135359921) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 5885206 + ... + 5885228.

Almost surely, 2^135359991 is an apocalyptic number.

135359991 is a deficient number, since it is larger than the sum of its proper divisors (93214817).

135359991 is an frugal number, since it uses more digits than its factorization.

135359991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 39 counting only the distinct ones).

The product of its digits is 164025, while the sum is 45.

The square root of 135359991 is about 11634.4312710162. The cubic root of 135359991 is about 513.4483614810.

The spelling of 135359991 in words is "one hundred thirty-five million, three hundred fifty-nine thousand, nine hundred ninety-one".