685310071 has 2 divisors, whose sum is σ = 685310072. Its totient is φ = 685310070.

The previous prime is 685310053. The next prime is 685310099. The reversal of 685310071 is 170013586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685310071 - 2²³ = 676921463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685310671) 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, 342655035 + 342655036.

It is an arithmetic number, because the mean of its divisors is an integer number (342655036).

Almost surely, 2^685310071 is an apocalyptic number.

685310071 is a deficient number, since it is larger than the sum of its proper divisors (1).

685310071 is an equidigital number, since it uses as much as digits as its factorization.

685310071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 685310071 is about 26178.4275883789. The cubic root of 685310071 is about 881.6489704215.

The spelling of 685310071 in words is "six hundred eighty-five million, three hundred ten thousand, seventy-one".