27506161 has 2 divisors, whose sum is σ = 27506162. Its totient is φ = 27506160.

The previous prime is 27506159. The next prime is 27506173. The reversal of 27506161 is 16160572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14861025 + 12645136 = 3855^2 + 3556^2 .

It is a cyclic number.

It is not a de Polignac number, because 27506161 - 2¹ = 27506159 is a prime.

Together with 27506159, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27506131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13753080 + 13753081.

It is an arithmetic number, because the mean of its divisors is an integer number (13753081).

Almost surely, 2^27506161 is an apocalyptic number.

It is an amenable number.

27506161 is a deficient number, since it is larger than the sum of its proper divisors (1).

27506161 is an equidigital number, since it uses as much as digits as its factorization.

27506161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 27506161 is about 5244.6316362544. The cubic root of 27506161 is about 301.8630762422.

It can be divided in two parts, 2750 and 6161, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 27506161 in words is "twenty-seven million, five hundred six thousand, one hundred sixty-one".