220381549 has 2 divisors, whose sum is σ = 220381550. Its totient is φ = 220381548.

The previous prime is 220381547. The next prime is 220381597. The reversal of 220381549 is 945183022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178222500 + 42159049 = 13350^2 + 6493^2 .

It is a cyclic number.

It is not a de Polignac number, because 220381549 - 2¹ = 220381547 is a prime.

Together with 220381547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220381547) 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 as a sum of consecutive naturals, namely, 110190774 + 110190775.

It is an arithmetic number, because the mean of its divisors is an integer number (110190775).

Almost surely, 2^220381549 is an apocalyptic number.

It is an amenable number.

220381549 is a deficient number, since it is larger than the sum of its proper divisors (1).

220381549 is an equidigital number, since it uses as much as digits as its factorization.

220381549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 220381549 is about 14845.2534164965. The cubic root of 220381549 is about 604.0298628935.

The spelling of 220381549 in words is "two hundred twenty million, three hundred eighty-one thousand, five hundred forty-nine".