685306331 has 2 divisors, whose sum is σ = 685306332. Its totient is φ = 685306330.

The previous prime is 685306313. The next prime is 685306343. The reversal of 685306331 is 133603586.

Together with previous prime (685306313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685306331 is a prime.

It is a super-2 number, since 2×685306331² = 939289534617363122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 685306291 and 685306300.

It is not a weakly prime, because it can be changed into another prime (685306361) 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, 342653165 + 342653166.

It is an arithmetic number, because the mean of its divisors is an integer number (342653166).

Almost surely, 2^685306331 is an apocalyptic number.

685306331 is a deficient number, since it is larger than the sum of its proper divisors (1).

685306331 is an equidigital number, since it uses as much as digits as its factorization.

685306331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 685306331 is about 26178.3561554197. The cubic root of 685306331 is about 881.6473665863.

The spelling of 685306331 in words is "six hundred eighty-five million, three hundred six thousand, three hundred thirty-one".