11517871 has 4 divisors (see below), whose sum is σ = 12018672. Its totient is φ = 11017072.

The previous prime is 11517859. The next prime is 11517881. The reversal of 11517871 is 17871511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11517871 - 2¹³ = 11509679 is a prime.

It is a super-2 number, since 2×11517871² = 265322704745282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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 (11517881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250366 + ... + 250411.

It is an arithmetic number, because the mean of its divisors is an integer number (3004668).

Almost surely, 2^11517871 is an apocalyptic number.

11517871 is a deficient number, since it is larger than the sum of its proper divisors (500801).

11517871 is an equidigital number, since it uses as much as digits as its factorization.

11517871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500800.

The product of its digits is 1960, while the sum is 31.

The square root of 11517871 is about 3393.7989038834. The cubic root of 11517871 is about 225.8347331180.

The spelling of 11517871 in words is "eleven million, five hundred seventeen thousand, eight hundred seventy-one".