991303801 has 2 divisors, whose sum is σ = 991303802. Its totient is φ = 991303800.

The previous prime is 991303787. The next prime is 991303867. The reversal of 991303801 is 108303199.

991303801 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 can be written as a sum of positive squares in only one way, i.e., 679957776 + 311346025 = 26076^2 + 17645^2 .

It is an emirp because it is prime and its reverse (108303199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991303801 - 2⁵ = 991303769 is a prime.

It is equal to p_50427826 and since 991303801 and 50427826 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (991303601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495651900 + 495651901.

It is an arithmetic number, because the mean of its divisors is an integer number (495651901).

Almost surely, 2^991303801 is an apocalyptic number.

It is an amenable number.

991303801 is a deficient number, since it is larger than the sum of its proper divisors (1).

991303801 is an equidigital number, since it uses as much as digits as its factorization.

991303801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 991303801 is about 31484.9773860487. The cubic root of 991303801 is about 997.0928235151.

The spelling of 991303801 in words is "nine hundred ninety-one million, three hundred three thousand, eight hundred one".