27018521 has 2 divisors, whose sum is σ = 27018522. Its totient is φ = 27018520.

The previous prime is 27018493. The next prime is 27018527. The reversal of 27018521 is 12581072.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14137600 + 12880921 = 3760^2 + 3589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27018521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27018527) 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, 13509260 + 13509261.

It is an arithmetic number, because the mean of its divisors is an integer number (13509261).

Almost surely, 2^27018521 is an apocalyptic number.

It is an amenable number.

27018521 is a deficient number, since it is larger than the sum of its proper divisors (1).

27018521 is an equidigital number, since it uses as much as digits as its factorization.

27018521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 27018521 is about 5197.9343012393. The cubic root of 27018521 is about 300.0685806174.

Adding to 27018521 its reverse (12581072), we get a palindrome (39599593).

The spelling of 27018521 in words is "twenty-seven million, eighteen thousand, five hundred twenty-one".