12240581 has 4 divisors (see below), whose sum is σ = 12662700. Its totient is φ = 11818464.

The previous prime is 12240559. The next prime is 12240583. The reversal of 12240581 is 18504221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18504221 = 241 ⋅76781.

It can be written as a sum of positive squares in 2 ways, for example, as 2992900 + 9247681 = 1730^2 + 3041^2 .

It is a cyclic number.

It is not a de Polignac number, because 12240581 - 2²² = 8046277 is a prime.

It is a super-2 number, since 2×12240581² = 299663646435122, 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 (12240583) 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 in 3 ways as a sum of consecutive naturals, for example, 211016 + ... + 211073.

It is an arithmetic number, because the mean of its divisors is an integer number (3165675).

Almost surely, 2^12240581 is an apocalyptic number.

It is an amenable number.

12240581 is a deficient number, since it is larger than the sum of its proper divisors (422119).

12240581 is an equidigital number, since it uses as much as digits as its factorization.

12240581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422118.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 12240581 is about 3498.6541698202. The cubic root of 12240581 is about 230.4627168694.

It can be divided in two parts, 12240 and 581, that added together give a palindrome (12821).

The spelling of 12240581 in words is "twelve million, two hundred forty thousand, five hundred eighty-one".