1025909 has 2 divisors, whose sum is σ = 1025910. Its totient is φ = 1025908.

The previous prime is 1025897. The next prime is 1025911. The reversal of 1025909 is 9095201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770884 + 255025 = 878^2 + 505^2 .

It is an emirp because it is prime and its reverse (9095201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1025909 - 2⁸ = 1025653 is a prime.

Together with 1025911, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512954 + 512955.

It is an arithmetic number, because the mean of its divisors is an integer number (512955).

2^1025909 is an apocalyptic number.

It is an amenable number.

1025909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025909 is an equidigital number, since it uses as much as digits as its factorization.

1025909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 1025909 is about 1012.8716601821. The cubic root of 1025909 is about 100.8562802468.

The spelling of 1025909 in words is "one million, twenty-five thousand, nine hundred nine".