10257809 has 2 divisors, whose sum is σ = 10257810. Its totient is φ = 10257808.

The previous prime is 10257787. The next prime is 10257823. The reversal of 10257809 is 90875201.

10257809 is digitally balanced in base 3, 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., 8720209 + 1537600 = 2953^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 10257809 - 2⁸ = 10257553 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10257829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5128904 + 5128905.

It is an arithmetic number, because the mean of its divisors is an integer number (5128905).

Almost surely, 2^10257809 is an apocalyptic number.

It is an amenable number.

10257809 is a deficient number, since it is larger than the sum of its proper divisors (1).

10257809 is an equidigital number, since it uses as much as digits as its factorization.

10257809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 10257809 is about 3202.7814474297. The cubic root of 10257809 is about 217.2792246039.

The spelling of 10257809 in words is "ten million, two hundred fifty-seven thousand, eight hundred nine".