11820571 has 16 divisors (see below), whose sum is σ = 13964544. Its totient is φ = 9795744.

The previous prime is 11820563. The next prime is 11820581. The reversal of 11820571 is 17502811.

It is not a de Polignac number, because 11820571 - 2³ = 11820563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11820521) 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 15 ways as a sum of consecutive naturals, for example, 51960 + ... + 52186.

It is an arithmetic number, because the mean of its divisors is an integer number (872784).

Almost surely, 2^11820571 is an apocalyptic number.

11820571 is a deficient number, since it is larger than the sum of its proper divisors (2143973).

11820571 is a wasteful number, since it uses less digits than its factorization.

11820571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 11820571 is about 3438.1057284499. The cubic root of 11820571 is about 227.7960305200.

The spelling of 11820571 in words is "eleven million, eight hundred twenty thousand, five hundred seventy-one".