11609305921 has 4 divisors (see below), whose sum is σ = 11772817344. Its totient is φ = 11445794500.

The previous prime is 11609305889. The next prime is 11609305931. The reversal of 11609305921 is 12950390611.

It is a happy number.

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 11609305921 - 2⁵ = 11609305889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11609305931) 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, 81755605 + ... + 81755746.

It is an arithmetic number, because the mean of its divisors is an integer number (2943204336).

Almost surely, 2^11609305921 is an apocalyptic number.

It is an amenable number.

11609305921 is a deficient number, since it is larger than the sum of its proper divisors (163511423).

11609305921 is an equidigital number, since it uses as much as digits as its factorization.

11609305921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163511422.

The product of its (nonzero) digits is 14580, while the sum is 37.

The spelling of 11609305921 in words is "eleven billion, six hundred nine million, three hundred five thousand, nine hundred twenty-one".