1025509 has 2 divisors, whose sum is σ = 1025510. Its totient is φ = 1025508.

The previous prime is 1025503. The next prime is 1025513. The reversal of 1025509 is 9055201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 804609 + 220900 = 897^2 + 470^2 .

It is an emirp because it is prime and its reverse (9055201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1025509 - 2⁵ = 1025477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1025509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512754 + 512755.

It is an arithmetic number, because the mean of its divisors is an integer number (512755).

2^1025509 is an apocalyptic number.

It is an amenable number.

1025509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025509 is an equidigital number, since it uses as much as digits as its factorization.

1025509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1025509 is about 1012.6741825484. The cubic root of 1025509 is about 100.8431706512.

The spelling of 1025509 in words is "one million, twenty-five thousand, five hundred nine".