684013249 has 2 divisors, whose sum is σ = 684013250. Its totient is φ = 684013248.

The previous prime is 684013247. The next prime is 684013271. The reversal of 684013249 is 942310486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658692225 + 25321024 = 25665^2 + 5032^2 .

It is a cyclic number.

It is not a de Polignac number, because 684013249 - 2¹ = 684013247 is a prime.

Together with 684013247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (684013247) 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, 342006624 + 342006625.

It is an arithmetic number, because the mean of its divisors is an integer number (342006625).

Almost surely, 2^684013249 is an apocalyptic number.

It is an amenable number.

684013249 is a deficient number, since it is larger than the sum of its proper divisors (1).

684013249 is an equidigital number, since it uses as much as digits as its factorization.

684013249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 684013249 is about 26153.6469541057. The cubic root of 684013249 is about 881.0925003038.

The spelling of 684013249 in words is "six hundred eighty-four million, thirteen thousand, two hundred forty-nine".