1325243209 has 4 divisors (see below), whose sum is σ = 1325409040. Its totient is φ = 1325077380.

The previous prime is 1325243201. The next prime is 1325243221. The reversal of 1325243209 is 9023425231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1325243209 - 2³ = 1325243201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1325243201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70287 + ... + 87124.

It is an arithmetic number, because the mean of its divisors is an integer number (331352260).

Almost surely, 2^1325243209 is an apocalyptic number.

It is an amenable number.

1325243209 is a deficient number, since it is larger than the sum of its proper divisors (165831).

1325243209 is an equidigital number, since it uses as much as digits as its factorization.

1325243209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165830.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1325243209 is about 36403.8900256552. The cubic root of 1325243209 is about 1098.4118152381.

The spelling of 1325243209 in words is "one billion, three hundred twenty-five million, two hundred forty-three thousand, two hundred nine".