27581161 has 2 divisors, whose sum is σ = 27581162. Its totient is φ = 27581160.

The previous prime is 27581119. The next prime is 27581171. The reversal of 27581161 is 16118572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23040000 + 4541161 = 4800^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 27581161 - 2⁹ = 27580649 is a prime.

It is not a weakly prime, because it can be changed into another prime (27581101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13790580 + 13790581.

It is an arithmetic number, because the mean of its divisors is an integer number (13790581).

Almost surely, 2^27581161 is an apocalyptic number.

It is an amenable number.

27581161 is a deficient number, since it is larger than the sum of its proper divisors (1).

27581161 is an equidigital number, since it uses as much as digits as its factorization.

27581161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 31.

The square root of 27581161 is about 5251.7769373803. The cubic root of 27581161 is about 302.1371867693.

The spelling of 27581161 in words is "twenty-seven million, five hundred eighty-one thousand, one hundred sixty-one".