684341857 has 2 divisors, whose sum is σ = 684341858. Its totient is φ = 684341856.

The previous prime is 684341843. The next prime is 684341863. The reversal of 684341857 is 758143486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 528816016 + 155525841 = 22996^2 + 12471^2 .

It is a cyclic number.

It is not a de Polignac number, because 684341857 - 2¹⁵ = 684309089 is a prime.

It is not a weakly prime, because it can be changed into another prime (684341657) 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, 342170928 + 342170929.

It is an arithmetic number, because the mean of its divisors is an integer number (342170929).

Almost surely, 2^684341857 is an apocalyptic number.

It is an amenable number.

684341857 is a deficient number, since it is larger than the sum of its proper divisors (1).

684341857 is an equidigital number, since it uses as much as digits as its factorization.

684341857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 46.

The square root of 684341857 is about 26159.9284593823. The cubic root of 684341857 is about 881.2335734443.

The spelling of 684341857 in words is "six hundred eighty-four million, three hundred forty-one thousand, eight hundred fifty-seven".