11913571 has 4 divisors (see below), whose sum is σ = 12057192. Its totient is φ = 11769952.

The previous prime is 11913553. The next prime is 11913581. The reversal of 11913571 is 17531911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17531911 = 23 ⋅762257.

It is a cyclic number.

It is not a de Polignac number, because 11913571 - 2¹⁹ = 11389283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11913541) 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, 71686 + ... + 71851.

It is an arithmetic number, because the mean of its divisors is an integer number (3014298).

Almost surely, 2^11913571 is an apocalyptic number.

11913571 is a deficient number, since it is larger than the sum of its proper divisors (143621).

11913571 is an equidigital number, since it uses as much as digits as its factorization.

11913571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143620.

The product of its digits is 945, while the sum is 28.

The square root of 11913571 is about 3451.6041198260. The cubic root of 11913571 is about 228.3918763462.

The spelling of 11913571 in words is "eleven million, nine hundred thirteen thousand, five hundred seventy-one".