27561983 has 2 divisors, whose sum is σ = 27561984. Its totient is φ = 27561982.

The previous prime is 27561979. The next prime is 27561997. The reversal of 27561983 is 38916572.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27561983 - 2² = 27561979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27561983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27561923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13780991 + 13780992.

It is an arithmetic number, because the mean of its divisors is an integer number (13780992).

Almost surely, 2^27561983 is an apocalyptic number.

27561983 is a deficient number, since it is larger than the sum of its proper divisors (1).

27561983 is an equidigital number, since it uses as much as digits as its factorization.

27561983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 27561983 is about 5249.9507616739. The cubic root of 27561983 is about 302.0671422137.

The spelling of 27561983 in words is "twenty-seven million, five hundred sixty-one thousand, nine hundred eighty-three".