11581671 has 4 divisors (see below), whose sum is σ = 15442232. Its totient is φ = 7721112.

The previous prime is 11581597. The next prime is 11581711. The reversal of 11581671 is 17618511.

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

It is not a de Polignac number, because 11581671 - 2⁹ = 11581159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11582671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1930276 + ... + 1930281.

It is an arithmetic number, because the mean of its divisors is an integer number (3860558).

Almost surely, 2^11581671 is an apocalyptic number.

11581671 is a deficient number, since it is larger than the sum of its proper divisors (3860561).

11581671 is an equidigital number, since it uses as much as digits as its factorization.

11581671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860560.

The product of its digits is 1680, while the sum is 30.

The square root of 11581671 is about 3403.1854195738. The cubic root of 11581671 is about 226.2509481763.

The spelling of 11581671 in words is "eleven million, five hundred eighty-one thousand, six hundred seventy-one".