12043015991 has 2 divisors, whose sum is σ = 12043015992. Its totient is φ = 12043015990.

The previous prime is 12043015987. The next prime is 12043016021. The reversal of 12043015991 is 19951034021.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12043015991 - 2² = 12043015987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12043015921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6021507995 + 6021507996.

It is an arithmetic number, because the mean of its divisors is an integer number (6021507996).

Almost surely, 2^12043015991 is an apocalyptic number.

12043015991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12043015991 is an equidigital number, since it uses as much as digits as its factorization.

12043015991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 12043015991 in words is "twelve billion, forty-three million, fifteen thousand, nine hundred ninety-one".