27545681 has 2 divisors, whose sum is σ = 27545682. Its totient is φ = 27545680.

The previous prime is 27545663. The next prime is 27545689. The reversal of 27545681 is 18654572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 8317456 = 4385^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 27545681 - 2¹⁴ = 27529297 is a prime.

It is a super-2 number, since 2×27545681² = 1517529083507522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27545689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13772840 + 13772841.

It is an arithmetic number, because the mean of its divisors is an integer number (13772841).

Almost surely, 2^27545681 is an apocalyptic number.

It is an amenable number.

27545681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27545681 is an equidigital number, since it uses as much as digits as its factorization.

27545681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The square root of 27545681 is about 5248.3979460403. The cubic root of 27545681 is about 302.0075762320.

The spelling of 27545681 in words is "twenty-seven million, five hundred forty-five thousand, six hundred eighty-one".