12106557 has 16 divisors (see below), whose sum is σ = 18000000. Its totient is φ = 8042112.

The previous prime is 12106537. The next prime is 12106559. The reversal of 12106557 is 75560121.

12106557 is a `hidden beast` number, since 1 + 2 + 1 + 0 + 655 + 7 = 666.

It is not a de Polignac number, because 12106557 - 2⁷ = 12106429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12106557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12106559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9069 + ... + 10317.

It is an arithmetic number, because the mean of its divisors is an integer number (1125000).

Almost surely, 2^12106557 is an apocalyptic number.

It is an amenable number.

12106557 is a deficient number, since it is larger than the sum of its proper divisors (5893443).

12106557 is a wasteful number, since it uses less digits than its factorization.

12106557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617 (or 1611 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 12106557 is about 3479.4478010167. The cubic root of 12106557 is about 229.6185043077.

Adding to 12106557 its reverse (75560121), we get a palindrome (87666678).

The spelling of 12106557 in words is "twelve million, one hundred six thousand, five hundred fifty-seven".