6989809 has 2 divisors, whose sum is σ = 6989810. Its totient is φ = 6989808.

The previous prime is 6989791. The next prime is 6989813. The reversal of 6989809 is 9089896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4950625 + 2039184 = 2225^2 + 1428^2 .

It is a cyclic number.

It is not a de Polignac number, because 6989809 - 2¹⁷ = 6858737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6989819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494904 + 3494905.

It is an arithmetic number, because the mean of its divisors is an integer number (3494905).

Almost surely, 2^6989809 is an apocalyptic number.

It is an amenable number.

6989809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989809 is an equidigital number, since it uses as much as digits as its factorization.

6989809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 6989809 is about 2643.8246916163. The cubic root of 6989809 is about 191.2002413733.

The spelling of 6989809 in words is "six million, nine hundred eighty-nine thousand, eight hundred nine".