135991659 has 4 divisors (see below), whose sum is σ = 181322216. Its totient is φ = 90661104.

The previous prime is 135991651. The next prime is 135991679. The reversal of 135991659 is 956199531.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 135991659 - 2³ = 135991651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135991651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22665274 + ... + 22665279.

It is an arithmetic number, because the mean of its divisors is an integer number (45330554).

Almost surely, 2^135991659 is an apocalyptic number.

135991659 is a deficient number, since it is larger than the sum of its proper divisors (45330557).

135991659 is an equidigital number, since it uses as much as digits as its factorization.

135991659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45330556.

The product of its digits is 328050, while the sum is 48.

The square root of 135991659 is about 11661.5461667825. The cubic root of 135991659 is about 514.2458046521.

The spelling of 135991659 in words is "one hundred thirty-five million, nine hundred ninety-one thousand, six hundred fifty-nine".