220891 has 8 divisors (see below), whose sum is σ = 247104. Its totient is φ = 195720.

The previous prime is 220889. The next prime is 220897. The reversal of 220891 is 198022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220891 - 2¹ = 220889 is a prime.

It is a super-3 number, since 3×220891³ = 32333693606423913, which contains 333 as substring.

220891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (220897) 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 7 ways as a sum of consecutive naturals, for example, 240 + ... + 706.

It is an arithmetic number, because the mean of its divisors is an integer number (30888).

2²²⁰⁸⁹¹ is an apocalyptic number.

220891 is a deficient number, since it is larger than the sum of its proper divisors (26213).

220891 is a wasteful number, since it uses less digits than its factorization.

220891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 220891 is about 469.9904254344. The cubic root of 220891 is about 60.4494945389.

It can be divided in two parts, 220 and 891, that added together give a palindrome (1111).

The spelling of 220891 in words is "two hundred twenty thousand, eight hundred ninety-one".