12581109 has 16 divisors (see below), whose sum is σ = 18786240. Its totient is φ = 8321040.

The previous prime is 12581089. The next prime is 12581111. The reversal of 12581109 is 90118521.

It is not a de Polignac number, because 12581109 - 2⁵ = 12581077 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1759 + ... + 5315.

It is an arithmetic number, because the mean of its divisors is an integer number (1174140).

Almost surely, 2^12581109 is an apocalyptic number.

It is an amenable number.

12581109 is a deficient number, since it is larger than the sum of its proper divisors (6205131).

12581109 is a wasteful number, since it uses less digits than its factorization.

12581109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3697 (or 3691 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12581109 is about 3546.9859035525. The cubic root of 12581109 is about 232.5803260432.

The spelling of 12581109 in words is "twelve million, five hundred eighty-one thousand, one hundred nine".