1320812609 has 4 divisors (see below), whose sum is σ = 1330895280. Its totient is φ = 1310729940.

The previous prime is 1320812587. The next prime is 1320812621. The reversal of 1320812609 is 9062180231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9062180231 = 13 ⋅697090787.

It is a cyclic number.

It is not a de Polignac number, because 1320812609 - 2¹² = 1320808513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320812699) 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, 5041139 + ... + 5041400.

It is an arithmetic number, because the mean of its divisors is an integer number (332723820).

Almost surely, 2^1320812609 is an apocalyptic number.

It is an amenable number.

1320812609 is a deficient number, since it is larger than the sum of its proper divisors (10082671).

1320812609 is a wasteful number, since it uses less digits than its factorization.

1320812609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10082670.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1320812609 is about 36342.9856918773. The cubic root of 1320812609 is about 1097.1863654807.

The spelling of 1320812609 in words is "one billion, three hundred twenty million, eight hundred twelve thousand, six hundred nine".