12045581 has 4 divisors (see below), whose sum is σ = 12137664. Its totient is φ = 11953500.

The previous prime is 12045521. The next prime is 12045589. The reversal of 12045581 is 18554021.

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: 18554021 = 17 ⋅1091413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12045581 is a prime.

It is a super-2 number, since 2×12045581² = 290192043255122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12045581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12045589) 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, 45845 + ... + 46106.

It is an arithmetic number, because the mean of its divisors is an integer number (3034416).

Almost surely, 2^12045581 is an apocalyptic number.

It is an amenable number.

12045581 is a deficient number, since it is larger than the sum of its proper divisors (92083).

12045581 is an equidigital number, since it uses as much as digits as its factorization.

12045581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92082.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 12045581 is about 3470.6744301360. The cubic root of 12045581 is about 229.2323557070.

The spelling of 12045581 in words is "twelve million, forty-five thousand, five hundred eighty-one".