27681001 has 2 divisors, whose sum is σ = 27681002. Its totient is φ = 27681000.

The previous prime is 27680977. The next prime is 27681011. The reversal of 27681001 is 10018672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 9610000 = 4251^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 27681001 - 2²¹ = 25583849 is a prime.

It is not a weakly prime, because it can be changed into another prime (27681011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13840500 + 13840501.

It is an arithmetic number, because the mean of its divisors is an integer number (13840501).

Almost surely, 2^27681001 is an apocalyptic number.

It is an amenable number.

27681001 is a deficient number, since it is larger than the sum of its proper divisors (1).

27681001 is an equidigital number, since it uses as much as digits as its factorization.

27681001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 27681001 is about 5261.2737051022. The cubic root of 27681001 is about 302.5013127462.

Adding to 27681001 its reverse (10018672), we get a palindrome (37699673).

The spelling of 27681001 in words is "twenty-seven million, six hundred eighty-one thousand, one".