685315087 has 2 divisors, whose sum is σ = 685315088. Its totient is φ = 685315086.

The previous prime is 685315063. The next prime is 685315093. The reversal of 685315087 is 780513586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685315087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685315027) 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, 342657543 + 342657544.

It is an arithmetic number, because the mean of its divisors is an integer number (342657544).

Almost surely, 2^685315087 is an apocalyptic number.

685315087 is a deficient number, since it is larger than the sum of its proper divisors (1).

685315087 is an equidigital number, since it uses as much as digits as its factorization.

685315087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 685315087 is about 26178.5233922771. The cubic root of 685315087 is about 881.6511214383.

The spelling of 685315087 in words is "six hundred eighty-five million, three hundred fifteen thousand, eighty-seven".