134565809 has 12 divisors (see below), whose sum is σ = 164775600. Its totient is φ = 109270728.

The previous prime is 134565793. The next prime is 134565839. The reversal of 134565809 is 908565431.

It is not a de Polignac number, because 134565809 - 2⁴ = 134565793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (134565839) 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, 71339 + ... + 73200.

It is an arithmetic number, because the mean of its divisors is an integer number (13731300).

Almost surely, 2^134565809 is an apocalyptic number.

134565809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

134565809 is a deficient number, since it is larger than the sum of its proper divisors (30209791).

134565809 is a wasteful number, since it uses less digits than its factorization.

134565809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144572 (or 144565 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 134565809 is about 11600.2503852288. The cubic root of 134565809 is about 512.4422258094.

The spelling of 134565809 in words is "one hundred thirty-four million, five hundred sixty-five thousand, eight hundred nine".