220001729 has 2 divisors, whose sum is σ = 220001730. Its totient is φ = 220001728.

The previous prime is 220001701. The next prime is 220001731. The reversal of 220001729 is 927100022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216678400 + 3323329 = 14720^2 + 1823^2 .

It is a cyclic number.

It is not a de Polignac number, because 220001729 - 2¹² = 219997633 is a prime.

Together with 220001731, 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 (220006729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110000864 + 110000865.

It is an arithmetic number, because the mean of its divisors is an integer number (110000865).

Almost surely, 2^220001729 is an apocalyptic number.

It is an amenable number.

220001729 is a deficient number, since it is larger than the sum of its proper divisors (1).

220001729 is an equidigital number, since it uses as much as digits as its factorization.

220001729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 220001729 is about 14832.4552586549. The cubic root of 220001729 is about 603.6826551371.

The spelling of 220001729 in words is "two hundred twenty million, one thousand, seven hundred twenty-nine".