135809651 has 4 divisors (see below), whose sum is σ = 143798472. Its totient is φ = 127820832.

The previous prime is 135809623. The next prime is 135809669. The reversal of 135809651 is 156908531.

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

It is a cyclic number.

It is not a de Polignac number, because 135809651 - 2¹⁴ = 135793267 is a prime.

It is a super-2 number, since 2×135809651² = 36888522609483602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135809621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3994385 + ... + 3994418.

It is an arithmetic number, because the mean of its divisors is an integer number (35949618).

Almost surely, 2^135809651 is an apocalyptic number.

135809651 is a deficient number, since it is larger than the sum of its proper divisors (7988821).

135809651 is an equidigital number, since it uses as much as digits as its factorization.

135809651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7988820.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 135809651 is about 11653.7397860086. The cubic root of 135809651 is about 514.0162841112.

The spelling of 135809651 in words is "one hundred thirty-five million, eight hundred nine thousand, six hundred fifty-one".