12157911 has 8 divisors (see below), whose sum is σ = 18011760. Its totient is φ = 8105256.

The previous prime is 12157909. The next prime is 12157927. The reversal of 12157911 is 11975121.

12157911 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12157911 - 2¹ = 12157909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 450293 = 12157911 / (1 + 2 + 1 + 5 + 7 + 9 + 1 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225120 + ... + 225173.

It is an arithmetic number, because the mean of its divisors is an integer number (2251470).

Almost surely, 2^12157911 is an apocalyptic number.

12157911 is a deficient number, since it is larger than the sum of its proper divisors (5853849).

12157911 is an equidigital number, since it uses as much as digits as its factorization.

12157911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450302 (or 450296 counting only the distinct ones).

The product of its digits is 630, while the sum is 27.

The square root of 12157911 is about 3486.8196110496. The cubic root of 12157911 is about 229.9427141515.

The spelling of 12157911 in words is "twelve million, one hundred fifty-seven thousand, nine hundred eleven".