9938581 has 2 divisors, whose sum is σ = 9938582. Its totient is φ = 9938580.

The previous prime is 9938563. The next prime is 9938597. The reversal of 9938581 is 1858399.

9938581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6100900 + 3837681 = 2470^2 + 1959^2 .

It is a cyclic number.

It is not a de Polignac number, because 9938581 - 2⁵ = 9938549 is a prime.

It is a super-2 number, since 2×9938581² = 197550784587122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9938531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969290 + 4969291.

It is an arithmetic number, because the mean of its divisors is an integer number (4969291).

Almost surely, 2^9938581 is an apocalyptic number.

It is an amenable number.

9938581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9938581 is an equidigital number, since it uses as much as digits as its factorization.

9938581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 9938581 is about 3152.5515063199. The cubic root of 9938581 is about 215.0014854774.

The spelling of 9938581 in words is "nine million, nine hundred thirty-eight thousand, five hundred eighty-one".