220551 has 4 divisors (see below), whose sum is σ = 294072. Its totient is φ = 147032.

The previous prime is 220543. The next prime is 220553. The reversal of 220551 is 155022.

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

It is a cyclic number.

It is not a de Polignac number, because 220551 - 2³ = 220543 is a prime.

It is a D-number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 220551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36756 + ... + 36761.

It is an arithmetic number, because the mean of its divisors is an integer number (73518).

2²²⁰⁵⁵¹ is an apocalyptic number.

220551 is a deficient number, since it is larger than the sum of its proper divisors (73521).

220551 is an equidigital number, since it uses as much as digits as its factorization.

220551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73520.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 220551 is about 469.6285766433. The cubic root of 220551 is about 60.4184635745.

Adding to 220551 its reverse (155022), we get a palindrome (375573).

The spelling of 220551 in words is "two hundred twenty thousand, five hundred fifty-one".