220947449 has 2 divisors, whose sum is σ = 220947450. Its totient is φ = 220947448.

The previous prime is 220947427. The next prime is 220947451. The reversal of 220947449 is 944749022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152967424 + 67980025 = 12368^2 + 8245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220947449 is a prime.

Together with 220947451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220947479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110473724 + 110473725.

It is an arithmetic number, because the mean of its divisors is an integer number (110473725).

Almost surely, 2^220947449 is an apocalyptic number.

It is an amenable number.

220947449 is a deficient number, since it is larger than the sum of its proper divisors (1).

220947449 is an equidigital number, since it uses as much as digits as its factorization.

220947449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 220947449 is about 14864.3011608350. The cubic root of 220947449 is about 604.5464341761.

The spelling of 220947449 in words is "two hundred twenty million, nine hundred forty-seven thousand, four hundred forty-nine".