10256209 has 2 divisors, whose sum is σ = 10256210. Its totient is φ = 10256208.

The previous prime is 10256201. The next prime is 10256243. The reversal of 10256209 is 90265201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9437184 + 819025 = 3072^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 10256209 - 2³ = 10256201 is a prime.

It is not a weakly prime, because it can be changed into another prime (10256201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5128104 + 5128105.

It is an arithmetic number, because the mean of its divisors is an integer number (5128105).

Almost surely, 2^10256209 is an apocalyptic number.

It is an amenable number.

10256209 is a deficient number, since it is larger than the sum of its proper divisors (1).

10256209 is an equidigital number, since it uses as much as digits as its factorization.

10256209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 10256209 is about 3202.5316548006. The cubic root of 10256209 is about 217.2679270374.

The spelling of 10256209 in words is "ten million, two hundred fifty-six thousand, two hundred nine".