9981208873 has 2 divisors, whose sum is σ = 9981208874. Its totient is φ = 9981208872.

The previous prime is 9981208819. The next prime is 9981208883. The reversal of 9981208873 is 3788021899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9103449744 + 877759129 = 95412^2 + 29627^2 .

It is a cyclic number.

It is not a de Polignac number, because 9981208873 - 2⁹ = 9981208361 is a prime.

It is not a weakly prime, because it can be changed into another prime (9981208813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990604436 + 4990604437.

It is an arithmetic number, because the mean of its divisors is an integer number (4990604437).

Almost surely, 2^9981208873 is an apocalyptic number.

It is an amenable number.

9981208873 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981208873 is an equidigital number, since it uses as much as digits as its factorization.

9981208873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 9981208873 is about 99906.0001851741. Note that the first 3 decimals coincide. The cubic root of 9981208873 is about 2153.0843686806.

The spelling of 9981208873 in words is "nine billion, nine hundred eighty-one million, two hundred eight thousand, eight hundred seventy-three".