999901101100901 has 2 divisors, whose sum is σ = 999901101100902. Its totient is φ = 999901101100900.

The previous prime is 999901101100897. The next prime is 999901101100927. The reversal of 999901101100901 is 109001101109999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 997667436343876 + 2233664757025 = 31585874^2 + 1494545^2 .

It is a cyclic number.

It is not a de Polignac number, because 999901101100901 - 2² = 999901101100897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999901101100901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999901101103901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499950550550450 + 499950550550451.

It is an arithmetic number, because the mean of its divisors is an integer number (499950550550451).

Almost surely, 2^{999901101100901} is an apocalyptic number.

It is an amenable number.

999901101100901 is a deficient number, since it is larger than the sum of its proper divisors (1).

999901101100901 is an equidigital number, since it uses as much as digits as its factorization.

999901101100901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59049, while the sum is 50.

The spelling of 999901101100901 in words is "nine hundred ninety-nine trillion, nine hundred one billion, one hundred one million, one hundred thousand, nine hundred one".