11561857 has 4 divisors (see below), whose sum is σ = 11588400. Its totient is φ = 11535316.

The previous prime is 11561843. The next prime is 11561863. The reversal of 11561857 is 75816511.

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.

It is a cyclic number.

It is not a de Polignac number, because 11561857 - 2²³ = 3173249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561827) 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, 12607 + ... + 13492.

It is an arithmetic number, because the mean of its divisors is an integer number (2897100).

Almost surely, 2^11561857 is an apocalyptic number.

It is an amenable number.

11561857 is a deficient number, since it is larger than the sum of its proper divisors (26543).

11561857 is an equidigital number, since it uses as much as digits as its factorization.

11561857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26542.

The product of its digits is 8400, while the sum is 34.

The square root of 11561857 is about 3400.2730772689. The cubic root of 11561857 is about 226.1218506509.

The spelling of 11561857 in words is "eleven million, five hundred sixty-one thousand, eight hundred fifty-seven".