220859581 has 4 divisors (see below), whose sum is σ = 222545664. Its totient is φ = 219173500.

The previous prime is 220859521. The next prime is 220859599. The reversal of 220859581 is 185958022.

220859581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220859581 - 2⁷ = 220859453 is a prime.

It is a super-2 number, since 2×220859581² = 97557909038991122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220859521) 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, 842845 + ... + 843106.

It is an arithmetic number, because the mean of its divisors is an integer number (55636416).

Almost surely, 2^220859581 is an apocalyptic number.

It is an amenable number.

220859581 is a deficient number, since it is larger than the sum of its proper divisors (1686083).

220859581 is a wasteful number, since it uses less digits than its factorization.

220859581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686082.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 220859581 is about 14861.3451948335. The cubic root of 220859581 is about 604.4662833988.

The spelling of 220859581 in words is "two hundred twenty million, eight hundred fifty-nine thousand, five hundred eighty-one".