10200809 has 2 divisors, whose sum is σ = 10200810. Its totient is φ = 10200808.

The previous prime is 10200797. The next prime is 10200821. The reversal of 10200809 is 90800201.

It is a balanced prime because it is at equal distance from previous prime (10200797) and next prime (10200821).

It can be written as a sum of positive squares in only one way, i.e., 5895184 + 4305625 = 2428^2 + 2075^2 .

It is an emirp because it is prime and its reverse (90800201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10200809 is a prime.

It is not a weakly prime, because it can be changed into another prime (10200859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100404 + 5100405.

It is an arithmetic number, because the mean of its divisors is an integer number (5100405).

Almost surely, 2^10200809 is an apocalyptic number.

It is an amenable number.

10200809 is a deficient number, since it is larger than the sum of its proper divisors (1).

10200809 is an equidigital number, since it uses as much as digits as its factorization.

10200809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 10200809 is about 3193.8705358859. The cubic root of 10200809 is about 216.8760219703.

The spelling of 10200809 in words is "ten million, two hundred thousand, eight hundred nine".