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685809263 is a prime number
BaseRepresentation
bin101000111000001…
…001111001101111
31202210110201110002
4220320021321233
52401031344023
6152015134515
722665165626
oct5070117157
91683421402
10685809263
11322137717
1217181443b
13ac1111c9
14671226bd
154031cb28
hex28e09e6f

685809263 has 2 divisors, whose sum is σ = 685809264. Its totient is φ = 685809262.

The previous prime is 685809247. The next prime is 685809277. The reversal of 685809263 is 362908586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685809263 - 24 = 685809247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685809283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342904631 + 342904632.

It is an arithmetic number, because the mean of its divisors is an integer number (342904632).

Almost surely, 2685809263 is an apocalyptic number.

685809263 is a deficient number, since it is larger than the sum of its proper divisors (1).

685809263 is an equidigital number, since it uses as much as digits as its factorization.

685809263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 685809263 is about 26187.9602680316. The cubic root of 685809263 is about 881.8629880430.

The spelling of 685809263 in words is "six hundred eighty-five million, eight hundred nine thousand, two hundred sixty-three".