12105553 has 2 divisors, whose sum is σ = 12105554. Its totient is φ = 12105552.

The previous prime is 12105551. The next prime is 12105563. The reversal of 12105553 is 35550121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11343424 + 762129 = 3368^2 + 873^2 .

It is a cyclic number.

It is not a de Polignac number, because 12105553 - 2¹ = 12105551 is a prime.

Together with 12105551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12105551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6052776 + 6052777.

It is an arithmetic number, because the mean of its divisors is an integer number (6052777).

Almost surely, 2^12105553 is an apocalyptic number.

It is an amenable number.

12105553 is a deficient number, since it is larger than the sum of its proper divisors (1).

12105553 is an equidigital number, since it uses as much as digits as its factorization.

12105553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 12105553 is about 3479.3035222584. The cubic root of 12105553 is about 229.6121566910.

Adding to 12105553 its reverse (35550121), we get a palindrome (47655674).

The spelling of 12105553 in words is "twelve million, one hundred five thousand, five hundred fifty-three".