9966331 has 2 divisors, whose sum is σ = 9966332. Its totient is φ = 9966330.

The previous prime is 9966329. The next prime is 9966347. The reversal of 9966331 is 1336699.

9966331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9966331 - 2¹ = 9966329 is a prime.

It is a super-2 number, since 2×9966331² = 198655507203122, which contains 22 as substring.

Together with 9966329, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (9966371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983165 + 4983166.

It is an arithmetic number, because the mean of its divisors is an integer number (4983166).

Almost surely, 2^9966331 is an apocalyptic number.

9966331 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966331 is an equidigital number, since it uses as much as digits as its factorization.

9966331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 37.

The square root of 9966331 is about 3156.9496353284. The cubic root of 9966331 is about 215.2014049258.

It can be divided in two parts, 99 and 66331, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 9966331 in words is "nine million, nine hundred sixty-six thousand, three hundred thirty-one".