90009901 has 2 divisors, whose sum is σ = 90009902. Its totient is φ = 90009900.

The previous prime is 90009839. The next prime is 90009919. The reversal of 90009901 is 10990009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58537801 + 31472100 = 7651^2 + 5610^2 .

It is a cyclic number.

It is not a de Polignac number, because 90009901 - 2⁹ = 90009389 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90009901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90009001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45004950 + 45004951.

It is an arithmetic number, because the mean of its divisors is an integer number (45004951).

Almost surely, 2^90009901 is an apocalyptic number.

It is an amenable number.

90009901 is a deficient number, since it is larger than the sum of its proper divisors (1).

90009901 is an equidigital number, since it uses as much as digits as its factorization.

90009901 is an odious number, because the sum of its binary digits is odd.

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

The square root of 90009901 is about 9487.3547946727. The cubic root of 90009901 is about 448.1569075303.

The spelling of 90009901 in words is "ninety million, nine thousand, nine hundred one".