889901109991 has 2 divisors, whose sum is σ = 889901109992. Its totient is φ = 889901109990.

The previous prime is 889901109931. The next prime is 889901110019. The reversal of 889901109991 is 199901109988.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 889901109991 - 2⁷ = 889901109863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (889901109931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 444950554995 + 444950554996.

It is an arithmetic number, because the mean of its divisors is an integer number (444950554996).

Almost surely, 2^889901109991 is an apocalyptic number.

889901109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

889901109991 is an equidigital number, since it uses as much as digits as its factorization.

889901109991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 64.

The spelling of 889901109991 in words is "eight hundred eighty-nine billion, nine hundred one million, one hundred nine thousand, nine hundred ninety-one".