27164561 has 4 divisors (see below), whose sum is σ = 28101300. Its totient is φ = 26227824.

The previous prime is 27164513. The next prime is 27164563. The reversal of 27164561 is 16546172.

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 9186961 + 17977600 = 3031^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 27164561 - 2¹⁸ = 26902417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27164563) 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, 468326 + ... + 468383.

It is an arithmetic number, because the mean of its divisors is an integer number (7025325).

Almost surely, 2^27164561 is an apocalyptic number.

It is an amenable number.

27164561 is a deficient number, since it is larger than the sum of its proper divisors (936739).

27164561 is an equidigital number, since it uses as much as digits as its factorization.

27164561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936738.

The product of its digits is 10080, while the sum is 32.

The square root of 27164561 is about 5211.9632577370. The cubic root of 27164561 is about 300.6082511203.

The spelling of 27164561 in words is "twenty-seven million, one hundred sixty-four thousand, five hundred sixty-one".