12104031991 has 2 divisors, whose sum is σ = 12104031992. Its totient is φ = 12104031990.

The previous prime is 12104031983. The next prime is 12104032043. The reversal of 12104031991 is 19913040121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12104031991 - 2³ = 12104031983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12104031391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6052015995 + 6052015996.

It is an arithmetic number, because the mean of its divisors is an integer number (6052015996).

Almost surely, 2^12104031991 is an apocalyptic number.

12104031991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12104031991 is an equidigital number, since it uses as much as digits as its factorization.

12104031991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 12104031991 in words is "twelve billion, one hundred four million, thirty-one thousand, nine hundred ninety-one".