220901 has 2 divisors, whose sum is σ = 220902. Its totient is φ = 220900.

The previous prime is 220897. The next prime is 220903. The reversal of 220901 is 109022.

It is a Cunningham number, because it is equal to 470²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 1 = 470^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 220901 - 2² = 220897 is a prime.

Together with 220903, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110450 + 110451.

It is an arithmetic number, because the mean of its divisors is an integer number (110451).

2²²⁰⁹⁰¹ is an apocalyptic number.

It is an amenable number.

220901 is a deficient number, since it is larger than the sum of its proper divisors (1).

220901 is an equidigital number, since it uses as much as digits as its factorization.

220901 is an evil number, because the sum of its binary digits is even.

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

The square root of 220901 is about 470.0010638286. The cubic root of 220901 is about 60.4504067322.

Adding to 220901 its reverse (109022), we get a palindrome (329923).

The spelling of 220901 in words is "two hundred twenty thousand, nine hundred one".