27561493 has 2 divisors, whose sum is σ = 27561494. Its totient is φ = 27561492.

The previous prime is 27561487. The next prime is 27561497. The reversal of 27561493 is 39416572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23882769 + 3678724 = 4887^2 + 1918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27561493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27561497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13780746 + 13780747.

It is an arithmetic number, because the mean of its divisors is an integer number (13780747).

Almost surely, 2^27561493 is an apocalyptic number.

It is an amenable number.

27561493 is a deficient number, since it is larger than the sum of its proper divisors (1).

27561493 is an equidigital number, since it uses as much as digits as its factorization.

27561493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 27561493 is about 5249.9040943621. The cubic root of 27561493 is about 302.0653521420.

The spelling of 27561493 in words is "twenty-seven million, five hundred sixty-one thousand, four hundred ninety-three".