12669581 has 4 divisors (see below), whose sum is σ = 12680700. Its totient is φ = 12658464.

The previous prime is 12669571. The next prime is 12669617. The reversal of 12669581 is 18596621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18596621 = 31 ⋅599891.

It can be written as a sum of positive squares in 2 ways, for example, as 10956100 + 1713481 = 3310^2 + 1309^2 .

It is a cyclic number.

It is not a de Polignac number, because 12669581 - 2²² = 8475277 is a prime.

It is a super-2 number, since 2×12669581² = 321036565431122, 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 (12669511) 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, 3626 + ... + 6203.

It is an arithmetic number, because the mean of its divisors is an integer number (3170175).

Almost surely, 2^12669581 is an apocalyptic number.

It is an amenable number.

12669581 is a deficient number, since it is larger than the sum of its proper divisors (11119).

12669581 is an equidigital number, since it uses as much as digits as its factorization.

12669581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118.

The product of its digits is 25920, while the sum is 38.

The square root of 12669581 is about 3559.4354889505. The cubic root of 12669581 is about 233.1242314901.

The spelling of 12669581 in words is "twelve million, six hundred sixty-nine thousand, five hundred eighty-one".