11911671 has 16 divisors (see below), whose sum is σ = 17848800. Its totient is φ = 7850304.

The previous prime is 11911667. The next prime is 11911681. The reversal of 11911671 is 17611911.

It is not a de Polignac number, because 11911671 - 2² = 11911667 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911681) 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, 76 + ... + 4881.

It is an arithmetic number, because the mean of its divisors is an integer number (1115550).

Almost surely, 2^11911671 is an apocalyptic number.

11911671 is a deficient number, since it is larger than the sum of its proper divisors (5937129).

11911671 is an equidigital number, since it uses as much as digits as its factorization.

11911671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055 (or 5049 counting only the distinct ones).

The product of its digits is 378, while the sum is 27.

The square root of 11911671 is about 3451.3288745062. The cubic root of 11911671 is about 228.3797342371.

The spelling of 11911671 in words is "eleven million, nine hundred eleven thousand, six hundred seventy-one".