9909901 has 2 divisors, whose sum is σ = 9909902. Its totient is φ = 9909900.

The previous prime is 9909881. The next prime is 9909917. The reversal of 9909901 is 1099099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 454276 = 3075^2 + 674^2 .

It is a cyclic number.

It is not a de Polignac number, because 9909901 - 2⁵ = 9909869 is a prime.

It is a super-2 number, since 2×9909901² = 196412275659602, which contains 22 as substring.

9909901 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9909961) 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, 4954950 + 4954951.

It is an arithmetic number, because the mean of its divisors is an integer number (4954951).

Almost surely, 2^9909901 is an apocalyptic number.

It is an amenable number.

9909901 is a deficient number, since it is larger than the sum of its proper divisors (1).

9909901 is an equidigital number, since it uses as much as digits as its factorization.

9909901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 9909901 is about 3147.9995235070. Note that the first 3 decimals coincide. The cubic root of 9909901 is about 214.7944745876.

The spelling of 9909901 in words is "nine million, nine hundred nine thousand, nine hundred one".