220091 has 4 divisors (see below), whose sum is σ = 221952. Its totient is φ = 218232.

The previous prime is 220063. The next prime is 220123. The reversal of 220091 is 190022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220091 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021) 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, 740 + ... + 993.

It is an arithmetic number, because the mean of its divisors is an integer number (55488).

2²²⁰⁰⁹¹ is an apocalyptic number.

220091 is a deficient number, since it is larger than the sum of its proper divisors (1861).

220091 is a wasteful number, since it uses less digits than its factorization.

220091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 220091 is about 469.1385722790. The cubic root of 220091 is about 60.3764297021.

The spelling of 220091 in words is "two hundred twenty thousand, ninety-one".