9999901 has 2 divisors, whose sum is σ = 9999902. Its totient is φ = 9999900.

The previous prime is 9999889. The next prime is 9999907. The reversal of 9999901 is 1099999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8732025 + 1267876 = 2955^2 + 1126^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999901 - 2¹⁷ = 9868829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999950 + 4999951.

It is an arithmetic number, because the mean of its divisors is an integer number (4999951).

Almost surely, 2^9999901 is an apocalyptic number.

It is an amenable number.

9999901 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999901 is an equidigital number, since it uses as much as digits as its factorization.

9999901 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 46.

The square root of 9999901 is about 3162.2620068552. The cubic root of 9999901 is about 215.4427580374.

It can be divided in two parts, 99 and 99901, that added together give a 5-th power (100000 = 10⁵).

The spelling of 9999901 in words is "nine million, nine hundred ninety-nine thousand, nine hundred one".