27081651391 has 2 divisors, whose sum is σ = 27081651392. Its totient is φ = 27081651390.

The previous prime is 27081651347. The next prime is 27081651413. The reversal of 27081651391 is 19315618072.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27081651391 - 2¹⁵ = 27081618623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27081652391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13540825695 + 13540825696.

It is an arithmetic number, because the mean of its divisors is an integer number (13540825696).

Almost surely, 2^27081651391 is an apocalyptic number.

27081651391 is a deficient number, since it is larger than the sum of its proper divisors (1).

27081651391 is an equidigital number, since it uses as much as digits as its factorization.

27081651391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 27081651391 in words is "twenty-seven billion, eighty-one million, six hundred fifty-one thousand, three hundred ninety-one".