8891689 has 2 divisors, whose sum is σ = 8891690. Its totient is φ = 8891688.

The previous prime is 8891657. The next prime is 8891693. The reversal of 8891689 is 9861988.

It is a happy number.

8891689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4481689 + 4410000 = 2117^2 + 2100^2 .

It is a cyclic number.

It is not a de Polignac number, because 8891689 - 2⁵ = 8891657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8091689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4445844 + 4445845.

It is an arithmetic number, because the mean of its divisors is an integer number (4445845).

Almost surely, 2^8891689 is an apocalyptic number.

It is an amenable number.

8891689 is a deficient number, since it is larger than the sum of its proper divisors (1).

8891689 is an equidigital number, since it uses as much as digits as its factorization.

8891689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 49.

The square root of 8891689 is about 2981.8935259328. The cubic root of 8891689 is about 207.1705829373.

Subtracting 8891689 from its reverse (9861988), we obtain a cube (970299 = 99³).

The spelling of 8891689 in words is "eight million, eight hundred ninety-one thousand, six hundred eighty-nine".