27189561 has 24 divisors (see below), whose sum is σ = 43320000. Its totient is φ = 15113952.

The previous prime is 27189529. The next prime is 27189571. The reversal of 27189561 is 16598172.

It is not a de Polignac number, because 27189561 - 2⁵ = 27189529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27189571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2940 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (1805000).

Almost surely, 2^27189561 is an apocalyptic number.

27189561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27189561 is a deficient number, since it is larger than the sum of its proper divisors (16130439).

27189561 is a wasteful number, since it uses less digits than its factorization.

27189561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053 (or 5046 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 27189561 is about 5214.3610346810. The cubic root of 27189561 is about 300.7004411125.

The spelling of 27189561 in words is "twenty-seven million, one hundred eighty-nine thousand, five hundred sixty-one".