1025209 has 2 divisors, whose sum is σ = 1025210. Its totient is φ = 1025208.

The previous prime is 1025203. The next prime is 1025231. The reversal of 1025209 is 9025201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861184 + 164025 = 928^2 + 405^2 .

It is an emirp because it is prime and its reverse (9025201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1025209 - 2⁷ = 1025081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1025203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512604 + 512605.

It is an arithmetic number, because the mean of its divisors is an integer number (512605).

2^1025209 is an apocalyptic number.

It is an amenable number.

1025209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025209 is an equidigital number, since it uses as much as digits as its factorization.

1025209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1025209 is about 1012.5260490476. The cubic root of 1025209 is about 100.8333362172.

The spelling of 1025209 in words is "one million, twenty-five thousand, two hundred nine".