12168557 has 4 divisors (see below), whose sum is σ = 12181920. Its totient is φ = 12155196.

The previous prime is 12168551. The next prime is 12168571. The reversal of 12168557 is 75586121.

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: 75586121 = 13 ⋅5814317.

It is a cyclic number.

It is not a de Polignac number, because 12168557 - 2¹² = 12164461 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 (12168551) 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, 5207 + ... + 7172.

It is an arithmetic number, because the mean of its divisors is an integer number (3045480).

Almost surely, 2^12168557 is an apocalyptic number.

It is an amenable number.

12168557 is a deficient number, since it is larger than the sum of its proper divisors (13363).

12168557 is an equidigital number, since it uses as much as digits as its factorization.

12168557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13362.

The product of its digits is 16800, while the sum is 35.

The square root of 12168557 is about 3488.3458830798. The cubic root of 12168557 is about 230.0098105456.

The spelling of 12168557 in words is "twelve million, one hundred sixty-eight thousand, five hundred fifty-seven".