1025609 has 4 divisors (see below), whose sum is σ = 1104516. Its totient is φ = 946704.

The previous prime is 1025579. The next prime is 1025611. The reversal of 1025609 is 9065201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9065201 = 1481 ⋅6121.

It can be written as a sum of positive squares in 2 ways, for example, as 265225 + 760384 = 515^2 + 872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1025659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39434 + ... + 39459.

It is an arithmetic number, because the mean of its divisors is an integer number (276129).

2^1025609 is an apocalyptic number.

It is an amenable number.

1025609 is a deficient number, since it is larger than the sum of its proper divisors (78907).

1025609 is an equidigital number, since it uses as much as digits as its factorization.

1025609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78906.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1025609 is about 1012.7235555669. The cubic root of 1025609 is about 100.8464483696.

The spelling of 1025609 in words is "one million, twenty-five thousand, six hundred nine".