12581689 has 2 divisors, whose sum is σ = 12581690. Its totient is φ = 12581688.

The previous prime is 12581659. The next prime is 12581693. The reversal of 12581689 is 98618521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 275625 = 3508^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 12581689 - 2¹¹ = 12579641 is a prime.

It is not a weakly prime, because it can be changed into another prime (12581659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6290844 + 6290845.

It is an arithmetic number, because the mean of its divisors is an integer number (6290845).

Almost surely, 2^12581689 is an apocalyptic number.

It is an amenable number.

12581689 is a deficient number, since it is larger than the sum of its proper divisors (1).

12581689 is an equidigital number, since it uses as much as digits as its factorization.

12581689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 40.

The square root of 12581689 is about 3547.0676621683. The cubic root of 12581689 is about 232.5839000397.

The spelling of 12581689 in words is "twelve million, five hundred eighty-one thousand, six hundred eighty-nine".