9901889 has 2 divisors, whose sum is σ = 9901890. Its totient is φ = 9901888.

The previous prime is 9901883. The next prime is 9901901. The reversal of 9901889 is 9881099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 3312400 = 2567^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 9901889 - 2¹² = 9897793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9901883) 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, 4950944 + 4950945.

It is an arithmetic number, because the mean of its divisors is an integer number (4950945).

Almost surely, 2^9901889 is an apocalyptic number.

It is an amenable number.

9901889 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901889 is an equidigital number, since it uses as much as digits as its factorization.

9901889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 9901889 is about 3146.7267119977. The cubic root of 9901889 is about 214.7365729893.

The spelling of 9901889 in words is "nine million, nine hundred one thousand, eight hundred eighty-nine".