12158999 has 2 divisors, whose sum is σ = 12159000. Its totient is φ = 12158998.

The previous prime is 12158989. The next prime is 12159011. The reversal of 12158999 is 99985121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12158999 - 2¹² = 12154903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12158989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6079499 + 6079500.

It is an arithmetic number, because the mean of its divisors is an integer number (6079500).

Almost surely, 2^12158999 is an apocalyptic number.

12158999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12158999 is an equidigital number, since it uses as much as digits as its factorization.

12158999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 44.

The square root of 12158999 is about 3486.9756236601. The cubic root of 12158999 is about 229.9495730658.

The spelling of 12158999 in words is "twelve million, one hundred fifty-eight thousand, nine hundred ninety-nine".