11681573 has 4 divisors (see below), whose sum is σ = 11689440. Its totient is φ = 11673708.

The previous prime is 11681569. The next prime is 11681609. The reversal of 11681573 is 37518611.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11681573 - 2² = 11681569 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 (11681543) 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, 953 + ... + 4926.

It is an arithmetic number, because the mean of its divisors is an integer number (2922360).

Almost surely, 2^11681573 is an apocalyptic number.

It is an amenable number.

11681573 is a deficient number, since it is larger than the sum of its proper divisors (7867).

11681573 is an equidigital number, since it uses as much as digits as its factorization.

11681573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866.

The product of its digits is 5040, while the sum is 32.

The square root of 11681573 is about 3417.8316225350. The cubic root of 11681573 is about 226.8996237696.

The spelling of 11681573 in words is "eleven million, six hundred eighty-one thousand, five hundred seventy-three".