889089991 has 2 divisors, whose sum is σ = 889089992. Its totient is φ = 889089990.

The previous prime is 889089967. The next prime is 889090019. The reversal of 889089991 is 199980988.

889089991 is nontrivially palindromic in base 4.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 889089991 - 2⁹ = 889089479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (889089791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 444544995 + 444544996.

It is an arithmetic number, because the mean of its divisors is an integer number (444544996).

Almost surely, 2^889089991 is an apocalyptic number.

889089991 is a deficient number, since it is larger than the sum of its proper divisors (1).

889089991 is an equidigital number, since it uses as much as digits as its factorization.

889089991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 61.

The square root of 889089991 is about 29817.6120941969. The cubic root of 889089991 is about 961.5722179291.

The spelling of 889089991 in words is "eight hundred eighty-nine million, eighty-nine thousand, nine hundred ninety-one".