1025689009 has 2 divisors, whose sum is σ = 1025689010. Its totient is φ = 1025689008.

The previous prime is 1025689003. The next prime is 1025689039. The reversal of 1025689009 is 9009865201.

1025689009 is digitally balanced in base 2, 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., 586995984 + 438693025 = 24228^2 + 20945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025689009 - 2³ = 1025689001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1025689001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512844504 + 512844505.

It is an arithmetic number, because the mean of its divisors is an integer number (512844505).

Almost surely, 2^1025689009 is an apocalyptic number.

It is an amenable number.

1025689009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025689009 is an equidigital number, since it uses as much as digits as its factorization.

1025689009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1025689009 is about 32026.3798922076. The cubic root of 1025689009 is about 1008.4907068594.

The spelling of 1025689009 in words is "one billion, twenty-five million, six hundred eighty-nine thousand, nine".