221745361 has 2 divisors, whose sum is σ = 221745362. Its totient is φ = 221745360.

The previous prime is 221745353. The next prime is 221745383. The reversal of 221745361 is 163547122.

221745361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218300625 + 3444736 = 14775^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 221745361 - 2³ = 221745353 is a prime.

It is not a weakly prime, because it can be changed into another prime (221745061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110872680 + 110872681.

It is an arithmetic number, because the mean of its divisors is an integer number (110872681).

Almost surely, 2^221745361 is an apocalyptic number.

It is an amenable number.

221745361 is a deficient number, since it is larger than the sum of its proper divisors (1).

221745361 is an equidigital number, since it uses as much as digits as its factorization.

221745361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 221745361 is about 14891.1168486450. The cubic root of 221745361 is about 605.2732968287.

The spelling of 221745361 in words is "two hundred twenty-one million, seven hundred forty-five thousand, three hundred sixty-one".