12581217 has 24 divisors (see below), whose sum is σ = 20492640. Its totient is φ = 7623000.

The previous prime is 12581183. The next prime is 12581227. The reversal of 12581217 is 71218521.

It is not a de Polignac number, because 12581217 - 2⁷ = 12581089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12581227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1342 + ... + 5192.

It is an arithmetic number, because the mean of its divisors is an integer number (853860).

Almost surely, 2^12581217 is an apocalyptic number.

It is an amenable number.

12581217 is a deficient number, since it is larger than the sum of its proper divisors (7911423).

12581217 is a wasteful number, since it uses less digits than its factorization.

12581217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3882 (or 3865 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 12581217 is about 3547.0011277134. The cubic root of 12581217 is about 232.5809915543.

Adding to 12581217 its reverse (71218521), we get a palindrome (83799738).

The spelling of 12581217 in words is "twelve million, five hundred eighty-one thousand, two hundred seventeen".