12405541 has 2 divisors, whose sum is σ = 12405542. Its totient is φ = 12405540.

The previous prime is 12405539. The next prime is 12405557. The reversal of 12405541 is 14550421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12397441 + 8100 = 3521^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 12405541 - 2¹ = 12405539 is a prime.

Together with 12405539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12405521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6202770 + 6202771.

It is an arithmetic number, because the mean of its divisors is an integer number (6202771).

Almost surely, 2^12405541 is an apocalyptic number.

It is an amenable number.

12405541 is a deficient number, since it is larger than the sum of its proper divisors (1).

12405541 is an equidigital number, since it uses as much as digits as its factorization.

12405541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 12405541 is about 3522.1500535894. The cubic root of 12405541 is about 231.4933764959.

Adding to 12405541 its reverse (14550421), we get a palindrome (26955962).

The spelling of 12405541 in words is "twelve million, four hundred five thousand, five hundred forty-one".