12220581 has 16 divisors (see below), whose sum is σ = 16744320. Its totient is φ = 7924800.

The previous prime is 12220573. The next prime is 12220601. The reversal of 12220581 is 18502221.

It is a happy number.

It is not a de Polignac number, because 12220581 - 2³ = 12220573 is a prime.

It is a super-2 number, since 2×12220581² = 298685199955122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220531) 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, 23755 + ... + 24263.

It is an arithmetic number, because the mean of its divisors is an integer number (1046520).

Almost surely, 2^12220581 is an apocalyptic number.

It is an amenable number.

12220581 is a deficient number, since it is larger than the sum of its proper divisors (4523739).

12220581 is a wasteful number, since it uses less digits than its factorization.

12220581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 12220581 is about 3495.7947594217. The cubic root of 12220581 is about 230.3371300478.

The spelling of 12220581 in words is "twelve million, two hundred twenty thousand, five hundred eighty-one".