27181601 has 2 divisors, whose sum is σ = 27181602. Its totient is φ = 27181600.

The previous prime is 27181577. The next prime is 27181603. The reversal of 27181601 is 10618172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26790976 + 390625 = 5176^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 27181601 - 2⁶ = 27181537 is a prime.

Together with 27181603, 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 (27181603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13590800 + 13590801.

It is an arithmetic number, because the mean of its divisors is an integer number (13590801).

Almost surely, 2^27181601 is an apocalyptic number.

It is an amenable number.

27181601 is a deficient number, since it is larger than the sum of its proper divisors (1).

27181601 is an equidigital number, since it uses as much as digits as its factorization.

27181601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 27181601 is about 5213.5977021631. The cubic root of 27181601 is about 300.6710939532.

Adding to 27181601 its reverse (10618172), we get a palindrome (37799773).

The spelling of 27181601 in words is "twenty-seven million, one hundred eighty-one thousand, six hundred one".