11561647 has 4 divisors (see below), whose sum is σ = 11674000. Its totient is φ = 11449296.

The previous prime is 11561639. The next prime is 11561653. The reversal of 11561647 is 74616511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74616511 = 2087 ⋅35753.

It is a cyclic number.

It is not a de Polignac number, because 11561647 - 2³ = 11561639 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 (11561687) 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, 56022 + ... + 56227.

It is an arithmetic number, because the mean of its divisors is an integer number (2918500).

Almost surely, 2^11561647 is an apocalyptic number.

11561647 is a deficient number, since it is larger than the sum of its proper divisors (112353).

11561647 is a wasteful number, since it uses less digits than its factorization.

11561647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112352.

The product of its digits is 5040, while the sum is 31.

The square root of 11561647 is about 3400.2421972560. The cubic root of 11561647 is about 226.1204816125.

The spelling of 11561647 in words is "eleven million, five hundred sixty-one thousand, six hundred forty-seven".