1325543809 has 2 divisors, whose sum is σ = 1325543810. Its totient is φ = 1325543808.

The previous prime is 1325543767. The next prime is 1325543827. The reversal of 1325543809 is 9083455231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1067459584 + 258084225 = 32672^2 + 16065^2 .

It is an emirp because it is prime and its reverse (9083455231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1325543809 - 2²³ = 1317155201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1325541809) 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 as a sum of consecutive naturals, namely, 662771904 + 662771905.

It is an arithmetic number, because the mean of its divisors is an integer number (662771905).

Almost surely, 2^1325543809 is an apocalyptic number.

It is an amenable number.

1325543809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325543809 is an equidigital number, since it uses as much as digits as its factorization.

1325543809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1325543809 is about 36408.0184712104. The cubic root of 1325543809 is about 1098.4948585184.

The spelling of 1325543809 in words is "one billion, three hundred twenty-five million, five hundred forty-three thousand, eight hundred nine".