27113809 has 4 divisors (see below), whose sum is σ = 27988480. Its totient is φ = 26239140.

The previous prime is 27113797. The next prime is 27113813. The reversal of 27113809 is 90831172.

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 27113809 - 2⁵ = 27113777 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 874639 = 27113809 / (2 + 7 + 1 + 1 + 3 + 8 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27113839) 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, 437289 + ... + 437350.

It is an arithmetic number, because the mean of its divisors is an integer number (6997120).

Almost surely, 2^27113809 is an apocalyptic number.

It is an amenable number.

27113809 is a deficient number, since it is larger than the sum of its proper divisors (874671).

27113809 is an equidigital number, since it uses as much as digits as its factorization.

27113809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874670.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 27113809 is about 5207.0921827830. The cubic root of 27113809 is about 300.4209239487.

The spelling of 27113809 in words is "twenty-seven million, one hundred thirteen thousand, eight hundred nine".