12105257 has 4 divisors (see below), whose sum is σ = 12114180. Its totient is φ = 12096336.

The previous prime is 12105211. The next prime is 12105271. The reversal of 12105257 is 75250121.

It is a happy number.

12105257 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75250121 = 193 ⋅389897.

It can be written as a sum of positive squares in 2 ways, for example, as 7678441 + 4426816 = 2771^2 + 2104^2 .

It is a cyclic number.

It is not a de Polignac number, because 12105257 - 2⁶ = 12105193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12105757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1958 + ... + 5295.

It is an arithmetic number, because the mean of its divisors is an integer number (3028545).

Almost surely, 2^12105257 is an apocalyptic number.

It is an amenable number.

12105257 is a deficient number, since it is larger than the sum of its proper divisors (8923).

12105257 is an equidigital number, since it uses as much as digits as its factorization.

12105257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8922.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 12105257 is about 3479.2609847495. The cubic root of 12105257 is about 229.6102852151.

Adding to 12105257 its reverse (75250121), we get a palindrome (87355378).

The spelling of 12105257 in words is "twelve million, one hundred five thousand, two hundred fifty-seven".