9991324801 has 2 divisors, whose sum is σ = 9991324802. Its totient is φ = 9991324800.

The previous prime is 9991324787. The next prime is 9991324841. The reversal of 9991324801 is 1084231999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9885131776 + 106193025 = 99424^2 + 10305^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991324801 - 2⁹ = 9991324289 is a prime.

It is not a weakly prime, because it can be changed into another prime (9991324841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995662400 + 4995662401.

It is an arithmetic number, because the mean of its divisors is an integer number (4995662401).

Almost surely, 2^9991324801 is an apocalyptic number.

It is an amenable number.

9991324801 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991324801 is an equidigital number, since it uses as much as digits as its factorization.

9991324801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 9991324801 is about 99956.6145935325. The cubic root of 9991324801 is about 2153.8115047996.

The spelling of 9991324801 in words is "nine billion, nine hundred ninety-one million, three hundred twenty-four thousand, eight hundred one".