12000010991 has 2 divisors, whose sum is σ = 12000010992. Its totient is φ = 12000010990.

The previous prime is 12000010871. The next prime is 12000011027. The reversal of 12000010991 is 19901000021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12000010991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12000010691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000005495 + 6000005496.

It is an arithmetic number, because the mean of its divisors is an integer number (6000005496).

Almost surely, 2^12000010991 is an apocalyptic number.

12000010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12000010991 is an equidigital number, since it uses as much as digits as its factorization.

12000010991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 12000010991 in words is "twelve billion, ten thousand, nine hundred ninety-one".