27128161 has 2 divisors, whose sum is σ = 27128162. Its totient is φ = 27128160.

The previous prime is 27128117. The next prime is 27128191. The reversal of 27128161 is 16182172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26718561 + 409600 = 5169^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 27128161 - 2⁷ = 27128033 is a prime.

It is equal to p_1690570 and since 27128161 and 1690570 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (27128191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564080 + 13564081.

It is an arithmetic number, because the mean of its divisors is an integer number (13564081).

Almost surely, 2^27128161 is an apocalyptic number.

It is an amenable number.

27128161 is a deficient number, since it is larger than the sum of its proper divisors (1).

27128161 is an equidigital number, since it uses as much as digits as its factorization.

27128161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 27128161 is about 5208.4701208704. The cubic root of 27128161 is about 300.4739213048.

The spelling of 27128161 in words is "twenty-seven million, one hundred twenty-eight thousand, one hundred sixty-one".