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685125869 is a prime number
BaseRepresentation
bin101000110101100…
…011000011101101
31202202012000000012
4220311203003231
52400343011434
6151552343005
722656321341
oct5065430355
91682160005
10685125869
1132181022a
12171544a65
13abc3212c
1466dc5621
15402353ce
hex28d630ed

685125869 has 2 divisors, whose sum is σ = 685125870. Its totient is φ = 685125868.

The previous prime is 685125811. The next prime is 685125871. The reversal of 685125869 is 968521586.

685125869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 448888969 + 236236900 = 21187^2 + 15370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-685125869 is a prime.

It is a super-2 number, since 2×6851258692 = 938794912746010322, which contains 22 as substring.

Together with 685125871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685125269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342562934 + 342562935.

It is an arithmetic number, because the mean of its divisors is an integer number (342562935).

Almost surely, 2685125869 is an apocalyptic number.

It is an amenable number.

685125869 is a deficient number, since it is larger than the sum of its proper divisors (1).

685125869 is an equidigital number, since it uses as much as digits as its factorization.

685125869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 50.

The square root of 685125869 is about 26174.9091497946. The cubic root of 685125869 is about 881.5699716037.

The spelling of 685125869 in words is "six hundred eighty-five million, one hundred twenty-five thousand, eight hundred sixty-nine".