9959581 has 2 divisors, whose sum is σ = 9959582. Its totient is φ = 9959580.

The previous prime is 9959563. The next prime is 9959611. The reversal of 9959581 is 1859599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5405625 + 4553956 = 2325^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 9959581 - 2¹¹ = 9957533 is a prime.

It is a super-2 number, since 2×9959581² = 198386507391122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9959981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4979790 + 4979791.

It is an arithmetic number, because the mean of its divisors is an integer number (4979791).

Almost surely, 2^9959581 is an apocalyptic number.

It is an amenable number.

9959581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9959581 is an equidigital number, since it uses as much as digits as its factorization.

9959581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 46.

The square root of 9959581 is about 3155.8803842985. The cubic root of 9959581 is about 215.1528100602.

The spelling of 9959581 in words is "nine million, nine hundred fifty-nine thousand, five hundred eighty-one".