27487991 has 2 divisors, whose sum is σ = 27487992. Its totient is φ = 27487990.

The previous prime is 27487987. The next prime is 27488009. The reversal of 27487991 is 19978472.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27487991 - 2² = 27487987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27487951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13743995 + 13743996.

It is an arithmetic number, because the mean of its divisors is an integer number (13743996).

Almost surely, 2^27487991 is an apocalyptic number.

27487991 is a deficient number, since it is larger than the sum of its proper divisors (1).

27487991 is an equidigital number, since it uses as much as digits as its factorization.

27487991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 27487991 is about 5242.8991025958. The cubic root of 27487991 is about 301.7965934366.

The spelling of 27487991 in words is "twenty-seven million, four hundred eighty-seven thousand, nine hundred ninety-one".