12942581 has 4 divisors (see below), whose sum is σ = 12960972. Its totient is φ = 12924192.

The previous prime is 12942571. The next prime is 12942607. The reversal of 12942581 is 18524921.

12942581 is nontrivially palindromic in base 5.

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 7789681 + 5152900 = 2791^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 12942581 - 2²² = 8748277 is a prime.

It is a super-2 number, since 2×12942581² = 335020805883122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12942521) 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, 8096 + ... + 9561.

It is an arithmetic number, because the mean of its divisors is an integer number (3240243).

Almost surely, 2^12942581 is an apocalyptic number.

It is an amenable number.

12942581 is a deficient number, since it is larger than the sum of its proper divisors (18391).

12942581 is an equidigital number, since it uses as much as digits as its factorization.

12942581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390.

The product of its digits is 5760, while the sum is 32.

The square root of 12942581 is about 3597.5798809755. The cubic root of 12942581 is about 234.7867750533.

The spelling of 12942581 in words is "twelve million, nine hundred forty-two thousand, five hundred eighty-one".