27506621 has 2 divisors, whose sum is σ = 27506622. Its totient is φ = 27506620.

The previous prime is 27506617. The next prime is 27506653. The reversal of 27506621 is 12660572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26265625 + 1240996 = 5125^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 27506621 - 2² = 27506617 is a prime.

It is a super-2 number, since 2×27506621² = 1513228397675282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27500621) 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, 13753310 + 13753311.

It is an arithmetic number, because the mean of its divisors is an integer number (13753311).

Almost surely, 2^27506621 is an apocalyptic number.

It is an amenable number.

27506621 is a deficient number, since it is larger than the sum of its proper divisors (1).

27506621 is an equidigital number, since it uses as much as digits as its factorization.

27506621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 27506621 is about 5244.6754904379. The cubic root of 27506621 is about 301.8647589711.

The spelling of 27506621 in words is "twenty-seven million, five hundred six thousand, six hundred twenty-one".