220791 has 4 divisors (see below), whose sum is σ = 294392. Its totient is φ = 147192.

The previous prime is 220789. The next prime is 220793. The reversal of 220791 is 197022.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (220789) and next prime (220793).

It is not a de Polignac number, because 220791 - 2¹ = 220789 is a prime.

It is an Ulam number.

It is a D-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 (220793) 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, 36796 + ... + 36801.

It is an arithmetic number, because the mean of its divisors is an integer number (73598).

2²²⁰⁷⁹¹ is an apocalyptic number.

220791 is a deficient number, since it is larger than the sum of its proper divisors (73601).

220791 is an equidigital number, since it uses as much as digits as its factorization.

220791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73600.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 220791 is about 469.8840282453. The cubic root of 220791 is about 60.4403710921.

The spelling of 220791 in words is "two hundred twenty thousand, seven hundred ninety-one".