12155863 has 2 divisors, whose sum is σ = 12155864. Its totient is φ = 12155862.

The previous prime is 12155851. The next prime is 12155881. The reversal of 12155863 is 36855121.

It is a weak prime.

It is an emirp because it is prime and its reverse (36855121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12155863 - 2¹³ = 12147671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12155893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077931 + 6077932.

It is an arithmetic number, because the mean of its divisors is an integer number (6077932).

Almost surely, 2^12155863 is an apocalyptic number.

12155863 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155863 is an equidigital number, since it uses as much as digits as its factorization.

12155863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 31.

The square root of 12155863 is about 3486.5259213148. The cubic root of 12155863 is about 229.9298021437.

The spelling of 12155863 in words is "twelve million, one hundred fifty-five thousand, eight hundred sixty-three".