9898987811 has 2 divisors, whose sum is σ = 9898987812. Its totient is φ = 9898987810.

The previous prime is 9898987799. The next prime is 9898987823. The reversal of 9898987811 is 1187898989.

It is a balanced prime because it is at equal distance from previous prime (9898987799) and next prime (9898987823).

It is a cyclic number.

It is not a de Polignac number, because 9898987811 - 2¹⁴ = 9898971427 is a prime.

It is not a weakly prime, because it can be changed into another prime (9898987841) 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, 4949493905 + 4949493906.

It is an arithmetic number, because the mean of its divisors is an integer number (4949493906).

Almost surely, 2^9898987811 is an apocalyptic number.

9898987811 is a deficient number, since it is larger than the sum of its proper divisors (1).

9898987811 is an equidigital number, since it uses as much as digits as its factorization.

9898987811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 68.

The square root of 9898987811 is about 99493.6571395383. The cubic root of 9898987811 is about 2147.1559880149.

The spelling of 9898987811 in words is "nine billion, eight hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred eleven".