685335961 has 2 divisors, whose sum is σ = 685335962. Its totient is φ = 685335960.

The previous prime is 685335953. The next prime is 685335983. The reversal of 685335961 is 169533586.

685335961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370947600 + 314388361 = 19260^2 + 17731^2 .

It is a cyclic number.

It is not a de Polignac number, because 685335961 - 2³ = 685335953 is a prime.

It is not a weakly prime, because it can be changed into another prime (685335661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342667980 + 342667981.

It is an arithmetic number, because the mean of its divisors is an integer number (342667981).

Almost surely, 2^685335961 is an apocalyptic number.

It is an amenable number.

685335961 is a deficient number, since it is larger than the sum of its proper divisors (1).

685335961 is an equidigital number, since it uses as much as digits as its factorization.

685335961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 46.

The square root of 685335961 is about 26178.9220748296. The cubic root of 685335961 is about 881.6600727460.

The spelling of 685335961 in words is "six hundred eighty-five million, three hundred thirty-five thousand, nine hundred sixty-one".