685185359 has 2 divisors, whose sum is σ = 685185360. Its totient is φ = 685185358.

The previous prime is 685185257. The next prime is 685185377. The reversal of 685185359 is 953581586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685185359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685185379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342592679 + 342592680.

It is an arithmetic number, because the mean of its divisors is an integer number (342592680).

Almost surely, 2^685185359 is an apocalyptic number.

685185359 is a deficient number, since it is larger than the sum of its proper divisors (1).

685185359 is an equidigital number, since it uses as much as digits as its factorization.

685185359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 50.

The square root of 685185359 is about 26176.0455187563. The cubic root of 685185359 is about 881.5954866621.

The spelling of 685185359 in words is "six hundred eighty-five million, one hundred eighty-five thousand, three hundred fifty-nine".