685735201 has 2 divisors, whose sum is σ = 685735202. Its totient is φ = 685735200.

The previous prime is 685735187. The next prime is 685735231. The reversal of 685735201 is 102537586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 468939025 + 216796176 = 21655^2 + 14724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685735201 is a prime.

It is not a weakly prime, because it can be changed into another prime (685735231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342867600 + 342867601.

It is an arithmetic number, because the mean of its divisors is an integer number (342867601).

Almost surely, 2^685735201 is an apocalyptic number.

It is an amenable number.

685735201 is a deficient number, since it is larger than the sum of its proper divisors (1).

685735201 is an equidigital number, since it uses as much as digits as its factorization.

685735201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 685735201 is about 26186.5461831071. The cubic root of 685735201 is about 881.8312421474.

The spelling of 685735201 in words is "six hundred eighty-five million, seven hundred thirty-five thousand, two hundred one".