12081997 has 2 divisors, whose sum is σ = 12081998. Its totient is φ = 12081996.

The previous prime is 12081991. The next prime is 12082027. The reversal of 12081997 is 79918021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8185321 + 3896676 = 2861^2 + 1974^2 .

It is a cyclic number.

It is not a de Polignac number, because 12081997 - 2³ = 12081989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12081991) 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, 6040998 + 6040999.

It is an arithmetic number, because the mean of its divisors is an integer number (6040999).

Almost surely, 2^12081997 is an apocalyptic number.

It is an amenable number.

12081997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12081997 is an equidigital number, since it uses as much as digits as its factorization.

12081997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12081997 is about 3475.9167136167. The cubic root of 12081997 is about 229.4631271224.

The spelling of 12081997 in words is "twelve million, eighty-one thousand, nine hundred ninety-seven".