12660091 has 2 divisors, whose sum is σ = 12660092. Its totient is φ = 12660090.

The previous prime is 12660013. The next prime is 12660101. The reversal of 12660091 is 19006621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12660091 - 2⁷ = 12659963 is a prime.

It is not a weakly prime, because it can be changed into another prime (12660191) 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, 6330045 + 6330046.

It is an arithmetic number, because the mean of its divisors is an integer number (6330046).

Almost surely, 2^12660091 is an apocalyptic number.

12660091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12660091 is an equidigital number, since it uses as much as digits as its factorization.

12660091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 12660091 is about 3558.1021626704. The cubic root of 12660091 is about 233.0660106338.

The spelling of 12660091 in words is "twelve million, six hundred sixty thousand, ninety-one".