991133202977 has 2 divisors, whose sum is σ = 991133202978. Its totient is φ = 991133202976.

The previous prime is 991133202949. The next prime is 991133203033. The reversal of 991133202977 is 779202331199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988352117281 + 2781085696 = 994159^2 + 52736^2 .

It is a cyclic number.

It is not a de Polignac number, because 991133202977 - 2⁸ = 991133202721 is a prime.

It is not a weakly prime, because it can be changed into another prime (991133202907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495566601488 + 495566601489.

It is an arithmetic number, because the mean of its divisors is an integer number (495566601489).

Almost surely, 2^991133202977 is an apocalyptic number.

It is an amenable number.

991133202977 is a deficient number, since it is larger than the sum of its proper divisors (1).

991133202977 is an equidigital number, since it uses as much as digits as its factorization.

991133202977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 53.

The spelling of 991133202977 in words is "nine hundred ninety-one billion, one hundred thirty-three million, two hundred two thousand, nine hundred seventy-seven".