11939780609 has 4 divisors (see below), whose sum is σ = 11940072516. Its totient is φ = 11939488704.

The previous prime is 11939780581. The next prime is 11939780621. The reversal of 11939780609 is 90608793911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90608793911 = 479 ⋅189162409.

It can be written as a sum of positive squares in 2 ways, for example, as 2756775025 + 9183005584 = 52505^2 + 95828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11939780609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11939780639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72164 + ... + 170549.

It is an arithmetic number, because the mean of its divisors is an integer number (2985018129).

Almost surely, 2^11939780609 is an apocalyptic number.

It is an amenable number.

11939780609 is a deficient number, since it is larger than the sum of its proper divisors (291907).

11939780609 is an equidigital number, since it uses as much as digits as its factorization.

11939780609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291906.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 11939780609 in words is "eleven billion, nine hundred thirty-nine million, seven hundred eighty thousand, six hundred nine".