10785809 has 2 divisors, whose sum is σ = 10785810. Its totient is φ = 10785808.

The previous prime is 10785793. The next prime is 10785811. The reversal of 10785809 is 90858701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6150400 + 4635409 = 2480^2 + 2153^2 .

It is an emirp because it is prime and its reverse (90858701) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10785809 - 2⁴ = 10785793 is a prime.

Together with 10785811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10785839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5392904 + 5392905.

It is an arithmetic number, because the mean of its divisors is an integer number (5392905).

Almost surely, 2^10785809 is an apocalyptic number.

It is an amenable number.

10785809 is a deficient number, since it is larger than the sum of its proper divisors (1).

10785809 is an equidigital number, since it uses as much as digits as its factorization.

10785809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 10785809 is about 3284.1755434203. The cubic root of 10785809 is about 220.9450324997.

The spelling of 10785809 in words is "ten million, seven hundred eighty-five thousand, eight hundred nine".