9009901 has 2 divisors, whose sum is σ = 9009902. Its totient is φ = 9009900.

The previous prime is 9009893. The next prime is 9009929. The reversal of 9009901 is 1099009.

It is an a-pointer prime, because the next prime (9009929) can be obtained adding 9009901 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 454276 = 2925^2 + 674^2 .

It is a cyclic number.

It is not a de Polignac number, because 9009901 - 2³ = 9009893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9009901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9009941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4504950 + 4504951.

It is an arithmetic number, because the mean of its divisors is an integer number (4504951).

Almost surely, 2^9009901 is an apocalyptic number.

It is an amenable number.

9009901 is a deficient number, since it is larger than the sum of its proper divisors (1).

9009901 is an equidigital number, since it uses as much as digits as its factorization.

9009901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 9009901 is about 3001.6497130745. The cubic root of 9009901 is about 208.0846317952.

It can be divided in two parts, 900 and 9901, that added together give a palindrome (10801).

The spelling of 9009901 in words is "nine million, nine thousand, nine hundred one".