11681577 has 20 divisors (see below), whose sum is σ = 18055620. Its totient is φ = 7517664.

The previous prime is 11681569. The next prime is 11681609. The reversal of 11681577 is 77518611.

It is a happy number.

11681577 is a `hidden beast` number, since 1 + 1 + 6 + 81 + 577 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6859161 + 4822416 = 2619^2 + 2196^2 .

It is not a de Polignac number, because 11681577 - 2³ = 11681569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11681557) 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 19 ways as a sum of consecutive naturals, for example, 138 + ... + 4835.

It is an arithmetic number, because the mean of its divisors is an integer number (902781).

Almost surely, 2^11681577 is an apocalyptic number.

It is an amenable number.

11681577 is a deficient number, since it is larger than the sum of its proper divisors (6374043).

11681577 is an equidigital number, since it uses as much as digits as its factorization.

11681577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5014 (or 5005 counting only the distinct ones).

The product of its digits is 11760, while the sum is 36.

The square root of 11681577 is about 3417.8322077012. The cubic root of 11681577 is about 226.8996496679.

The spelling of 11681577 in words is "eleven million, six hundred eighty-one thousand, five hundred seventy-seven".