27617921 has 2 divisors, whose sum is σ = 27617922. Its totient is φ = 27617920.

The previous prime is 27617903. The next prime is 27617927. The reversal of 27617921 is 12971672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 11296321 = 4040^2 + 3361^2 .

It is a cyclic number.

It is not a de Polignac number, because 27617921 - 2¹⁸ = 27355777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27617927) 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, 13808960 + 13808961.

It is an arithmetic number, because the mean of its divisors is an integer number (13808961).

Almost surely, 2^27617921 is an apocalyptic number.

It is an amenable number.

27617921 is a deficient number, since it is larger than the sum of its proper divisors (1).

27617921 is an equidigital number, since it uses as much as digits as its factorization.

27617921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 35.

The square root of 27617921 is about 5255.2755398742. The cubic root of 27617921 is about 302.2713560353.

The spelling of 27617921 in words is "twenty-seven million, six hundred seventeen thousand, nine hundred twenty-one".