12105157 has 4 divisors (see below), whose sum is σ = 12241260. Its totient is φ = 11969056.

The previous prime is 12105143. The next prime is 12105167. The reversal of 12105157 is 75150121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2869636 + 9235521 = 1694^2 + 3039^2 .

It is a cyclic number.

It is not a de Polignac number, because 12105157 - 2⁷ = 12105029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105167) 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 in 3 ways as a sum of consecutive naturals, for example, 67918 + ... + 68095.

It is an arithmetic number, because the mean of its divisors is an integer number (3060315).

Almost surely, 2^12105157 is an apocalyptic number.

It is an amenable number.

12105157 is a deficient number, since it is larger than the sum of its proper divisors (136103).

12105157 is an equidigital number, since it uses as much as digits as its factorization.

12105157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136102.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 12105157 is about 3479.2466138519. The cubic root of 12105157 is about 229.6096529528.

Adding to 12105157 its reverse (75150121), we get a palindrome (87255278).

The spelling of 12105157 in words is "twelve million, one hundred five thousand, one hundred fifty-seven".