12581621 has 16 divisors (see below), whose sum is σ = 14636160. Its totient is φ = 10718400.

The previous prime is 12581603. The next prime is 12581627. The reversal of 12581621 is 12618521.

It is not a de Polignac number, because 12581621 - 2⁶ = 12581557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7946 + ... + 9396.

It is an arithmetic number, because the mean of its divisors is an integer number (914760).

Almost surely, 2^12581621 is an apocalyptic number.

It is an amenable number.

12581621 is a deficient number, since it is larger than the sum of its proper divisors (2054539).

12581621 is a wasteful number, since it uses less digits than its factorization.

12581621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516.

The product of its digits is 960, while the sum is 26.

The square root of 12581621 is about 3547.0580767729. The cubic root of 12581621 is about 232.5834810251.

The spelling of 12581621 in words is "twelve million, five hundred eighty-one thousand, six hundred twenty-one".