1325906609 has 2 divisors, whose sum is σ = 1325906610. Its totient is φ = 1325906608.

The previous prime is 1325906563. The next prime is 1325906623. The reversal of 1325906609 is 9066095231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228292209 + 97614400 = 35047^2 + 9880^2 .

It is an emirp because it is prime and its reverse (9066095231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1325906609 - 2¹⁶ = 1325841073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1325906639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662953304 + 662953305.

It is an arithmetic number, because the mean of its divisors is an integer number (662953305).

Almost surely, 2^1325906609 is an apocalyptic number.

It is an amenable number.

1325906609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325906609 is an equidigital number, since it uses as much as digits as its factorization.

1325906609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 1325906609 is about 36413.0005492544. Note that the first 3 decimals coincide. The cubic root of 1325906609 is about 1098.5950683538.

The spelling of 1325906609 in words is "one billion, three hundred twenty-five million, nine hundred six thousand, six hundred nine".