685852441 has 2 divisors, whose sum is σ = 685852442. Its totient is φ = 685852440.

The previous prime is 685852421. The next prime is 685852477. The reversal of 685852441 is 144258586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613602441 + 72250000 = 24771^2 + 8500^2 .

It is a cyclic number.

It is not a de Polignac number, because 685852441 - 2¹⁹ = 685328153 is a prime.

It is not a weakly prime, because it can be changed into another prime (685852421) 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, 342926220 + 342926221.

It is an arithmetic number, because the mean of its divisors is an integer number (342926221).

Almost surely, 2^685852441 is an apocalyptic number.

It is an amenable number.

685852441 is a deficient number, since it is larger than the sum of its proper divisors (1).

685852441 is an equidigital number, since it uses as much as digits as its factorization.

685852441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 307200, while the sum is 43.

The square root of 685852441 is about 26188.7846415216. The cubic root of 685852441 is about 881.8814947830.

The spelling of 685852441 in words is "six hundred eighty-five million, eight hundred fifty-two thousand, four hundred forty-one".