8891009 has 2 divisors, whose sum is σ = 8891010. Its totient is φ = 8891008.

The previous prime is 8890997. The next prime is 8891033. The reversal of 8891009 is 9001988.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8880400 + 10609 = 2980^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 8891009 - 2²⁰ = 7842433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8891009.

It is not a weakly prime, because it can be changed into another prime (8891059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4445504 + 4445505.

It is an arithmetic number, because the mean of its divisors is an integer number (4445505).

Almost surely, 2^8891009 is an apocalyptic number.

It is an amenable number.

8891009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8891009 is an equidigital number, since it uses as much as digits as its factorization.

8891009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 8891009 is about 2981.7795022436. The cubic root of 8891009 is about 207.1653016165.

The spelling of 8891009 in words is "eight million, eight hundred ninety-one thousand, nine".