11776561 has 4 divisors (see below), whose sum is σ = 12396400. Its totient is φ = 11156724.

The previous prime is 11776537. The next prime is 11776591. The reversal of 11776561 is 16567711.

11776561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 11776561 - 2⁹ = 11776049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11776591) 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, 309891 + ... + 309928.

It is an arithmetic number, because the mean of its divisors is an integer number (3099100).

Almost surely, 2^11776561 is an apocalyptic number.

It is an amenable number.

11776561 is a deficient number, since it is larger than the sum of its proper divisors (619839).

11776561 is an equidigital number, since it uses as much as digits as its factorization.

11776561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619838.

The product of its digits is 8820, while the sum is 34.

The square root of 11776561 is about 3431.6994332255. The cubic root of 11776561 is about 227.5129711237.

The spelling of 11776561 in words is "eleven million, seven hundred seventy-six thousand, five hundred sixty-one".