11561657 has 4 divisors (see below), whose sum is σ = 11568720. Its totient is φ = 11554596.

The previous prime is 11561653. The next prime is 11561681. The reversal of 11561657 is 75616511.

11561657 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, 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 11561657 - 2² = 11561653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561653) 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, 338 + ... + 4820.

It is an arithmetic number, because the mean of its divisors is an integer number (2892180).

Almost surely, 2^11561657 is an apocalyptic number.

It is an amenable number.

11561657 is a deficient number, since it is larger than the sum of its proper divisors (7063).

11561657 is an equidigital number, since it uses as much as digits as its factorization.

11561657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062.

The product of its digits is 6300, while the sum is 32.

The square root of 11561657 is about 3400.2436677391. The cubic root of 11561657 is about 226.1205468052.

The spelling of 11561657 in words is "eleven million, five hundred sixty-one thousand, six hundred fifty-seven".