12505541 has 4 divisors (see below), whose sum is σ = 12552300. Its totient is φ = 12458784.

The previous prime is 12505501. The next prime is 12505543. The reversal of 12505541 is 14550521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2608225 + 9897316 = 1615^2 + 3146^2 .

It is a cyclic number.

It is not a de Polignac number, because 12505541 - 2¹⁰ = 12504517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505543) 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, 22976 + ... + 23513.

It is an arithmetic number, because the mean of its divisors is an integer number (3138075).

Almost surely, 2^12505541 is an apocalyptic number.

It is an amenable number.

12505541 is a deficient number, since it is larger than the sum of its proper divisors (46759).

12505541 is an equidigital number, since it uses as much as digits as its factorization.

12505541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46758.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 12505541 is about 3536.3174348466. The cubic root of 12505541 is about 232.1137286732.

The spelling of 12505541 in words is "twelve million, five hundred five thousand, five hundred forty-one".