1009901 has 2 divisors, whose sum is σ = 1009902. Its totient is φ = 1009900.

The previous prime is 1009873. The next prime is 1009909. The reversal of 1009901 is 1099001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561001 + 448900 = 749^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009901 - 2⁶ = 1009837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009909) 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, 504950 + 504951.

It is an arithmetic number, because the mean of its divisors is an integer number (504951).

2^1009901 is an apocalyptic number.

It is an amenable number.

1009901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009901 is an equidigital number, since it uses as much as digits as its factorization.

1009901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1009901 is about 1004.9383065641. The cubic root of 1009901 is about 100.3289500654.

It can be divided in two parts, 100 and 9901, that added together give a palindrome (10001).

The spelling of 1009901 in words is "one million, nine thousand, nine hundred one".