10212809 has 2 divisors, whose sum is σ = 10212810. Its totient is φ = 10212808.

The previous prime is 10212799. The next prime is 10212821. The reversal of 10212809 is 90821201.

10212809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6390784 + 3822025 = 2528^2 + 1955^2 .

It is an emirp because it is prime and its reverse (90821201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10212859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106404 + 5106405.

It is an arithmetic number, because the mean of its divisors is an integer number (5106405).

Almost surely, 2^10212809 is an apocalyptic number.

It is an amenable number.

10212809 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212809 is an equidigital number, since it uses as much as digits as its factorization.

10212809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 10212809 is about 3195.7485821009. The cubic root of 10212809 is about 216.9610313200.

The spelling of 10212809 in words is "ten million, two hundred twelve thousand, eight hundred nine".