12081157 has 4 divisors (see below), whose sum is σ = 13179456. Its totient is φ = 10982860.

The previous prime is 12081149. The next prime is 12081161. The reversal of 12081157 is 75118021.

12081157 is digitally balanced in base 3, because in such base 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 Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75118021 = 11 ⋅6828911.

It is a cyclic number.

It is not a de Polignac number, because 12081157 - 2³ = 12081149 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 (12081257) 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, 549133 + ... + 549154.

It is an arithmetic number, because the mean of its divisors is an integer number (3294864).

Almost surely, 2^12081157 is an apocalyptic number.

It is an amenable number.

12081157 is a deficient number, since it is larger than the sum of its proper divisors (1098299).

12081157 is a wasteful number, since it uses less digits than its factorization.

12081157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098298.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 12081157 is about 3475.7958800827. The cubic root of 12081157 is about 229.4578091965.

Adding to 12081157 its reverse (75118021), we get a palindrome (87199178).

The spelling of 12081157 in words is "twelve million, eighty-one thousand, one hundred fifty-seven".