12845581 has 4 divisors (see below), whose sum is σ = 14680672. Its totient is φ = 11010492.

The previous prime is 12845561. The next prime is 12845597. The reversal of 12845581 is 18554821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18554821 = 149 ⋅124529.

It is a cyclic number.

It is not a de Polignac number, because 12845581 - 2⁷ = 12845453 is a prime.

It is a super-2 number, since 2×12845581² = 330017902455122, 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 (12845561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917535 + ... + 917548.

It is an arithmetic number, because the mean of its divisors is an integer number (3670168).

Almost surely, 2^12845581 is an apocalyptic number.

It is an amenable number.

12845581 is a deficient number, since it is larger than the sum of its proper divisors (1835091).

12845581 is an equidigital number, since it uses as much as digits as its factorization.

12845581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835090.

The product of its digits is 12800, while the sum is 34.

The square root of 12845581 is about 3584.0732414391. The cubic root of 12845581 is about 234.1987560594.

The spelling of 12845581 in words is "twelve million, eight hundred forty-five thousand, five hundred eighty-one".