12105857 has 2 divisors, whose sum is σ = 12105858. Its totient is φ = 12105856.

The previous prime is 12105851. The next prime is 12105859. The reversal of 12105857 is 75850121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11182336 + 923521 = 3344^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 12105857 - 2⁸ = 12105601 is a prime.

Together with 12105859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12105851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6052928 + 6052929.

It is an arithmetic number, because the mean of its divisors is an integer number (6052929).

Almost surely, 2^12105857 is an apocalyptic number.

It is an amenable number.

12105857 is a deficient number, since it is larger than the sum of its proper divisors (1).

12105857 is an equidigital number, since it uses as much as digits as its factorization.

12105857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 12105857 is about 3479.3472088885. The cubic root of 12105857 is about 229.6140787156.

Adding to 12105857 its reverse (75850121), we get a palindrome (87955978).

The spelling of 12105857 in words is "twelve million, one hundred five thousand, eight hundred fifty-seven".