220651 has 4 divisors (see below), whose sum is σ = 221832. Its totient is φ = 219472.

The previous prime is 220613. The next prime is 220663. The reversal of 220651 is 156022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 220651 - 2¹⁵ = 187883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220681) 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, 241 + ... + 706.

It is an arithmetic number, because the mean of its divisors is an integer number (55458).

2²²⁰⁶⁵¹ is an apocalyptic number.

220651 is a deficient number, since it is larger than the sum of its proper divisors (1181).

220651 is an equidigital number, since it uses as much as digits as its factorization.

220651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 220651 is about 469.7350316934. The cubic root of 220651 is about 60.4275936373.

Adding to 220651 its reverse (156022), we get a palindrome (376673).

The spelling of 220651 in words is "two hundred twenty thousand, six hundred fifty-one".