12581591 has 16 divisors (see below), whose sum is σ = 14847360. Its totient is φ = 10536480.

The previous prime is 12581587. The next prime is 12581599. The reversal of 12581591 is 19518521.

It is a cyclic number.

It is not a de Polignac number, because 12581591 - 2² = 12581587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581599) 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, 6920 + ... + 8546.

It is an arithmetic number, because the mean of its divisors is an integer number (927960).

Almost surely, 2^12581591 is an apocalyptic number.

12581591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12581591 is a deficient number, since it is larger than the sum of its proper divisors (2265769).

12581591 is a wasteful number, since it uses less digits than its factorization.

12581591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694.

The product of its digits is 3600, while the sum is 32.

The square root of 12581591 is about 3547.0538479138. The cubic root of 12581591 is about 232.5832961652.

The spelling of 12581591 in words is "twelve million, five hundred eighty-one thousand, five hundred ninety-one".