9900811873 has 2 divisors, whose sum is σ = 9900811874. Its totient is φ = 9900811872.

The previous prime is 9900811871. The next prime is 9900811891. The reversal of 9900811873 is 3781180099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9602628049 + 298183824 = 97993^2 + 17268^2 .

It is a cyclic number.

It is not a de Polignac number, because 9900811873 - 2¹ = 9900811871 is a prime.

Together with 9900811871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9900811871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950405936 + 4950405937.

It is an arithmetic number, because the mean of its divisors is an integer number (4950405937).

Almost surely, 2^9900811873 is an apocalyptic number.

It is an amenable number.

9900811873 is a deficient number, since it is larger than the sum of its proper divisors (1).

9900811873 is an equidigital number, since it uses as much as digits as its factorization.

9900811873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 9900811873 is about 99502.8234423526. The cubic root of 9900811873 is about 2147.2878636228.

The spelling of 9900811873 in words is "nine billion, nine hundred million, eight hundred eleven thousand, eight hundred seventy-three".