27286561 has 2 divisors, whose sum is σ = 27286562. Its totient is φ = 27286560.

The previous prime is 27286559. The next prime is 27286583. The reversal of 27286561 is 16568272.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22268961 + 5017600 = 4719^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 27286561 - 2¹ = 27286559 is a prime.

It is a super-2 number, since 2×27286561² = 1489112822413442, which contains 22 as substring.

Together with 27286559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27286561.

It is not a weakly prime, because it can be changed into another prime (27286531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13643280 + 13643281.

It is an arithmetic number, because the mean of its divisors is an integer number (13643281).

Almost surely, 2^27286561 is an apocalyptic number.

It is an amenable number.

27286561 is a deficient number, since it is larger than the sum of its proper divisors (1).

27286561 is an equidigital number, since it uses as much as digits as its factorization.

27286561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 27286561 is about 5223.6539893067. The cubic root of 27286561 is about 301.0576042333.

The spelling of 27286561 in words is "twenty-seven million, two hundred eighty-six thousand, five hundred sixty-one".