11557871 has 16 divisors (see below), whose sum is σ = 13302240. Its totient is φ = 9953280.

The previous prime is 11557837. The next prime is 11557873. The reversal of 11557871 is 17875511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11557871 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11557873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17711 + ... + 18351.

It is an arithmetic number, because the mean of its divisors is an integer number (831390).

Almost surely, 2^11557871 is an apocalyptic number.

11557871 is a deficient number, since it is larger than the sum of its proper divisors (1744369).

11557871 is a wasteful number, since it uses less digits than its factorization.

11557871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746.

The product of its digits is 9800, while the sum is 35.

The square root of 11557871 is about 3399.6868973480. The cubic root of 11557871 is about 226.0958621701.

The spelling of 11557871 in words is "eleven million, five hundred fifty-seven thousand, eight hundred seventy-one".