9931866331 has 2 divisors, whose sum is σ = 9931866332. Its totient is φ = 9931866330.

The previous prime is 9931866323. The next prime is 9931866349. The reversal of 9931866331 is 1336681399.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9931866331 - 2³ = 9931866323 is a prime.

It is a super-2 number, since 2×9931866331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9931864331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4965933165 + 4965933166.

It is an arithmetic number, because the mean of its divisors is an integer number (4965933166).

Almost surely, 2^9931866331 is an apocalyptic number.

9931866331 is a deficient number, since it is larger than the sum of its proper divisors (1).

9931866331 is an equidigital number, since it uses as much as digits as its factorization.

9931866331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 49.

The square root of 9931866331 is about 99658.7493951234. The cubic root of 9931866331 is about 2149.5305505415.

It can be divided in two parts, 99318 and 66331, that added together give a square (165649 = 407²).

The spelling of 9931866331 in words is "nine billion, nine hundred thirty-one million, eight hundred sixty-six thousand, three hundred thirty-one".