12644581 has 8 divisors (see below), whose sum is σ = 12952224. Its totient is φ = 12339600.

The previous prime is 12644579. The next prime is 12644591. The reversal of 12644581 is 18544621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12644581 - 2¹ = 12644579 is a prime.

It is a super-2 number, since 2×12644581² = 319770857331122, 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 (12644561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11506 + ... + 12556.

It is an arithmetic number, because the mean of its divisors is an integer number (1619028).

Almost surely, 2^12644581 is an apocalyptic number.

It is an amenable number.

12644581 is a deficient number, since it is larger than the sum of its proper divisors (307643).

12644581 is a wasteful number, since it uses less digits than its factorization.

12644581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331.

The product of its digits is 7680, while the sum is 31.

The square root of 12644581 is about 3555.9219620234. The cubic root of 12644581 is about 232.9707945981.

It can be divided in two parts, 12644 and 581, that added together give a square (13225 = 115²).

The spelling of 12644581 in words is "twelve million, six hundred forty-four thousand, five hundred eighty-one".