27161521 has 2 divisors, whose sum is σ = 27161522. Its totient is φ = 27161520.

The previous prime is 27161513. The next prime is 27161527. The reversal of 27161521 is 12516172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22667121 + 4494400 = 4761^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 27161521 - 2³ = 27161513 is a prime.

It is not a weakly prime, because it can be changed into another prime (27161527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13580760 + 13580761.

It is an arithmetic number, because the mean of its divisors is an integer number (13580761).

Almost surely, 2^27161521 is an apocalyptic number.

It is an amenable number.

27161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

27161521 is an equidigital number, since it uses as much as digits as its factorization.

27161521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 25.

The square root of 27161521 is about 5211.6716128321. The cubic root of 27161521 is about 300.5970369606.

Adding to 27161521 its reverse (12516172), we get a palindrome (39677693).

The spelling of 27161521 in words is "twenty-seven million, one hundred sixty-one thousand, five hundred twenty-one".