12001012091 has 2 divisors, whose sum is σ = 12001012092. Its totient is φ = 12001012090.

The previous prime is 12001012073. The next prime is 12001012129. The reversal of 12001012091 is 19021010021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001012091 is a prime.

It is not a weakly prime, because it can be changed into another prime (12001012031) 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, 6000506045 + 6000506046.

It is an arithmetic number, because the mean of its divisors is an integer number (6000506046).

Almost surely, 2^12001012091 is an apocalyptic number.

12001012091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001012091 is an equidigital number, since it uses as much as digits as its factorization.

12001012091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 12001012091 in words is "twelve billion, one million, twelve thousand, ninety-one".