12727991 has 2 divisors, whose sum is σ = 12727992. Its totient is φ = 12727990.

The previous prime is 12727987. The next prime is 12728029. The reversal of 12727991 is 19972721.

It is an a-pointer prime, because the next prime (12728029) can be obtained adding 12727991 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12727991 - 2² = 12727987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12727291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6363995 + 6363996.

It is an arithmetic number, because the mean of its divisors is an integer number (6363996).

Almost surely, 2^12727991 is an apocalyptic number.

12727991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12727991 is an equidigital number, since it uses as much as digits as its factorization.

12727991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 38.

The square root of 12727991 is about 3567.6310067046. The cubic root of 12727991 is about 233.4819364048.

The spelling of 12727991 in words is "twelve million, seven hundred twenty-seven thousand, nine hundred ninety-one".