220261 has 4 divisors (see below), whose sum is σ = 226252. Its totient is φ = 214272.

The previous prime is 220243. The next prime is 220279. The reversal of 220261 is 162022.

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 (220243) and next prime (220279).

It can be written as a sum of positive squares in 2 ways, for example, as 84100 + 136161 = 290^2 + 369^2 .

It is a cyclic number.

It is not a de Polignac number, because 220261 - 2⁹ = 219749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2940 + ... + 3013.

It is an arithmetic number, because the mean of its divisors is an integer number (56563).

2²²⁰²⁶¹ is an apocalyptic number.

It is an amenable number.

220261 is a deficient number, since it is larger than the sum of its proper divisors (5991).

220261 is an equidigital number, since it uses as much as digits as its factorization.

220261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5990.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 220261 is about 469.3197204465. The cubic root of 220261 is about 60.3919707760.

Adding to 220261 its reverse (162022), we get a palindrome (382283).

The spelling of 220261 in words is "two hundred twenty thousand, two hundred sixty-one".