12403203991 has 2 divisors, whose sum is σ = 12403203992. Its totient is φ = 12403203990.

The previous prime is 12403203983. The next prime is 12403204003. The reversal of 12403203991 is 19930230421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12403203991 - 2³ = 12403203983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12403203931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6201601995 + 6201601996.

It is an arithmetic number, because the mean of its divisors is an integer number (6201601996).

Almost surely, 2^12403203991 is an apocalyptic number.

12403203991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12403203991 is an equidigital number, since it uses as much as digits as its factorization.

12403203991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 12403203991 in words is "twelve billion, four hundred three million, two hundred three thousand, nine hundred ninety-one".