9988331 has 2 divisors, whose sum is σ = 9988332. Its totient is φ = 9988330.

The previous prime is 9988313. The next prime is 9988339. The reversal of 9988331 is 1338899.

9988331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (9988313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9988331 - 2²² = 5794027 is a prime.

It is a super-2 number, since 2×9988331² = 199533512331122, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (9988339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994165 + 4994166.

It is an arithmetic number, because the mean of its divisors is an integer number (4994166).

Almost surely, 2^9988331 is an apocalyptic number.

9988331 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988331 is an equidigital number, since it uses as much as digits as its factorization.

9988331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 9988331 is about 3160.4320907116. The cubic root of 9988331 is about 215.3596360585.

The spelling of 9988331 in words is "nine million, nine hundred eighty-eight thousand, three hundred thirty-one".