11671571 has 4 divisors (see below), whose sum is σ = 12358152. Its totient is φ = 10984992.

The previous prime is 11671547. The next prime is 11671573. The reversal of 11671571 is 17517611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17517611 = 2797 ⋅6263.

It is not a de Polignac number, because 11671571 - 2⁶ = 11671507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11671573) 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, 343265 + ... + 343298.

It is an arithmetic number, because the mean of its divisors is an integer number (3089538).

Almost surely, 2^11671571 is an apocalyptic number.

11671571 is a deficient number, since it is larger than the sum of its proper divisors (686581).

11671571 is an equidigital number, since it uses as much as digits as its factorization.

11671571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686580.

The product of its digits is 1470, while the sum is 29.

The square root of 11671571 is about 3416.3681007760. The cubic root of 11671571 is about 226.8348465899.

The spelling of 11671571 in words is "eleven million, six hundred seventy-one thousand, five hundred seventy-one".