684541441 has 2 divisors, whose sum is σ = 684541442. Its totient is φ = 684541440.

The previous prime is 684541409. The next prime is 684541489. The reversal of 684541441 is 144145486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578883600 + 105657841 = 24060^2 + 10279^2 .

It is a cyclic number.

It is not a de Polignac number, because 684541441 - 2⁵ = 684541409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684541441.

It is not a weakly prime, because it can be changed into another prime (684548441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342270720 + 342270721.

It is an arithmetic number, because the mean of its divisors is an integer number (342270721).

Almost surely, 2^684541441 is an apocalyptic number.

It is an amenable number.

684541441 is a deficient number, since it is larger than the sum of its proper divisors (1).

684541441 is an equidigital number, since it uses as much as digits as its factorization.

684541441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61440, while the sum is 37.

The square root of 684541441 is about 26163.7428706216. The cubic root of 684541441 is about 881.3192338611.

The spelling of 684541441 in words is "six hundred eighty-four million, five hundred forty-one thousand, four hundred forty-one".