684217229 has 2 divisors, whose sum is σ = 684217230. Its totient is φ = 684217228.

The previous prime is 684217217. The next prime is 684217243. The reversal of 684217229 is 922712486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434514025 + 249703204 = 20845^2 + 15802^2 .

It is a cyclic number.

It is not a de Polignac number, because 684217229 - 2¹² = 684213133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684217279) 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, 342108614 + 342108615.

It is an arithmetic number, because the mean of its divisors is an integer number (342108615).

Almost surely, 2^684217229 is an apocalyptic number.

It is an amenable number.

684217229 is a deficient number, since it is larger than the sum of its proper divisors (1).

684217229 is an equidigital number, since it uses as much as digits as its factorization.

684217229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 684217229 is about 26157.5463107685. The cubic root of 684217229 is about 881.1800753062.

The spelling of 684217229 in words is "six hundred eighty-four million, two hundred seventeen thousand, two hundred twenty-nine".