9989381 has 2 divisors, whose sum is σ = 9989382. Its totient is φ = 9989380.

The previous prime is 9989377. The next prime is 9989389. The reversal of 9989381 is 1839899.

9989381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6713281 + 3276100 = 2591^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 9989381 - 2² = 9989377 is a prime.

It is a super-2 number, since 2×9989381² = 199575465526322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9989389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994690 + 4994691.

It is an arithmetic number, because the mean of its divisors is an integer number (4994691).

Almost surely, 2^9989381 is an apocalyptic number.

It is an amenable number.

9989381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9989381 is an equidigital number, since it uses as much as digits as its factorization.

9989381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The square root of 9989381 is about 3160.5982028724. The cubic root of 9989381 is about 215.3671821872.

The spelling of 9989381 in words is "nine million, nine hundred eighty-nine thousand, three hundred eighty-one".