684590441 has 2 divisors, whose sum is σ = 684590442. Its totient is φ = 684590440.

The previous prime is 684590371. The next prime is 684590461. The reversal of 684590441 is 144095486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547794025 + 136796416 = 23405^2 + 11696^2 .

It is a cyclic number.

It is not a de Polignac number, because 684590441 - 2¹⁸ = 684328297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (684590461) 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, 342295220 + 342295221.

It is an arithmetic number, because the mean of its divisors is an integer number (342295221).

Almost surely, 2^684590441 is an apocalyptic number.

It is an amenable number.

684590441 is a deficient number, since it is larger than the sum of its proper divisors (1).

684590441 is an equidigital number, since it uses as much as digits as its factorization.

684590441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 684590441 is about 26164.6792642295. The cubic root of 684590441 is about 881.3402618610.

The spelling of 684590441 in words is "six hundred eighty-four million, five hundred ninety thousand, four hundred forty-one".