135263809 has 4 divisors (see below), whose sum is σ = 135752404. Its totient is φ = 134775216.

The previous prime is 135263789. The next prime is 135263833. The reversal of 135263809 is 908362531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46621584 + 88642225 = 6828^2 + 9415^2 .

It is a cyclic number.

It is not a de Polignac number, because 135263809 - 2²⁷ = 1046081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135260809) 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 in 3 ways as a sum of consecutive naturals, for example, 243882 + ... + 244435.

It is an arithmetic number, because the mean of its divisors is an integer number (33938101).

Almost surely, 2^135263809 is an apocalyptic number.

It is an amenable number.

135263809 is a deficient number, since it is larger than the sum of its proper divisors (488595).

135263809 is an equidigital number, since it uses as much as digits as its factorization.

135263809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488594.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 135263809 is about 11630.2970297409. The cubic root of 135263809 is about 513.3267199444.

The spelling of 135263809 in words is "one hundred thirty-five million, two hundred sixty-three thousand, eight hundred nine".