11781061 has 4 divisors (see below), whose sum is σ = 11980800. Its totient is φ = 11581324.

The previous prime is 11781043. The next prime is 11781089. The reversal of 11781061 is 16018711.

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: 16018711 = 1423 ⋅11257.

It is a cyclic number.

It is not a de Polignac number, because 11781061 - 2⁷ = 11780933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99781 + ... + 99898.

It is an arithmetic number, because the mean of its divisors is an integer number (2995200).

Almost surely, 2^11781061 is an apocalyptic number.

It is an amenable number.

11781061 is a deficient number, since it is larger than the sum of its proper divisors (199739).

11781061 is an equidigital number, since it uses as much as digits as its factorization.

11781061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199738.

The product of its (nonzero) digits is 336, while the sum is 25.

The square root of 11781061 is about 3432.3550224299. The cubic root of 11781061 is about 227.5419461359.

Adding to 11781061 its reverse (16018711), we get a palindrome (27799772).

The spelling of 11781061 in words is "eleven million, seven hundred eighty-one thousand, sixty-one".