53609809 has 4 divisors (see below), whose sum is σ = 58483440. Its totient is φ = 48736180.

The previous prime is 53609791. The next prime is 53609821. The reversal of 53609809 is 90890635.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53609809 - 2¹³ = 53601617 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53609879) 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, 2436799 + ... + 2436820.

It is an arithmetic number, because the mean of its divisors is an integer number (14620860).

Almost surely, 2^53609809 is an apocalyptic number.

It is an amenable number.

53609809 is a deficient number, since it is larger than the sum of its proper divisors (4873631).

53609809 is a wasteful number, since it uses less digits than its factorization.

53609809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4873630.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 53609809 is about 7321.8719600933. The cubic root of 53609809 is about 377.0637247546.

The spelling of 53609809 in words is "fifty-three million, six hundred nine thousand, eight hundred nine".