12367991 has 2 divisors, whose sum is σ = 12367992. Its totient is φ = 12367990.

The previous prime is 12367981. The next prime is 12368009. The reversal of 12367991 is 19976321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12367991 - 2¹⁴ = 12351607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12367981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6183995 + 6183996.

It is an arithmetic number, because the mean of its divisors is an integer number (6183996).

Almost surely, 2^12367991 is an apocalyptic number.

12367991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12367991 is an equidigital number, since it uses as much as digits as its factorization.

12367991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 12367991 is about 3516.8154628868. The cubic root of 12367991 is about 231.2595734045.

The spelling of 12367991 in words is "twelve million, three hundred sixty-seven thousand, nine hundred ninety-one".