12005541 has 6 divisors (see below), whose sum is σ = 17341350. Its totient is φ = 8003688.

The previous prime is 12005537. The next prime is 12005597. The reversal of 12005541 is 14550021.

12005541 is a `hidden beast` number, since 120 + 0 + 5 + 541 = 666.

12005541 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11902500 + 103041 = 3450^2 + 321^2 .

It is not a de Polignac number, because 12005541 - 2² = 12005537 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666966 + ... + 666983.

It is an arithmetic number, because the mean of its divisors is an integer number (2890225).

Almost surely, 2^12005541 is an apocalyptic number.

It is an amenable number.

12005541 is a deficient number, since it is larger than the sum of its proper divisors (5335809).

12005541 is a wasteful number, since it uses less digits than its factorization.

12005541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333955 (or 1333952 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 12005541 is about 3464.9012972955. The cubic root of 12005541 is about 228.9780812084.

Adding to 12005541 its reverse (14550021), we get a palindrome (26555562).

The spelling of 12005541 in words is "twelve million, five thousand, five hundred forty-one".