12265581 has 4 divisors (see below), whose sum is σ = 16354112. Its totient is φ = 8177052.

The previous prime is 12265573. The next prime is 12265597. The reversal of 12265581 is 18556221.

12265581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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: 18556221 = 3 ⋅6185407.

It is not a de Polignac number, because 12265581 - 2³ = 12265573 is a prime.

It is a super-2 number, since 2×12265581² = 300888954535122, which contains 22 as substring.

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 (12265511) 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, 2044261 + ... + 2044266.

It is an arithmetic number, because the mean of its divisors is an integer number (4088528).

Almost surely, 2^12265581 is an apocalyptic number.

It is an amenable number.

12265581 is a deficient number, since it is larger than the sum of its proper divisors (4088531).

12265581 is an equidigital number, since it uses as much as digits as its factorization.

12265581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088530.

The product of its digits is 4800, while the sum is 30.

The square root of 12265581 is about 3502.2251498155. The cubic root of 12265581 is about 230.6195081719.

It can be divided in two parts, 122 and 65581, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 12265581 in words is "twelve million, two hundred sixty-five thousand, five hundred eighty-one".