12581605 has 8 divisors (see below), whose sum is σ = 15118200. Its totient is φ = 10051776.

The previous prime is 12581603. The next prime is 12581627. The reversal of 12581605 is 50618521.

12581605 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1069156 + 11512449 = 1034^2 + 3393^2 .

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 12581605 - 2¹ = 12581603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4411 + ... + 6679.

It is an arithmetic number, because the mean of its divisors is an integer number (1889775).

Almost surely, 2^12581605 is an apocalyptic number.

It is an amenable number.

12581605 is a deficient number, since it is larger than the sum of its proper divisors (2536595).

12581605 is a wasteful number, since it uses less digits than its factorization.

12581605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 12581605 is about 3547.0558213820. The cubic root of 12581605 is about 232.5833824332.

The spelling of 12581605 in words is "twelve million, five hundred eighty-one thousand, six hundred five".