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687109 is a prime number
BaseRepresentation
bin10100111110000000101
31021220112111
42213300011
5133441414
622421021
75561143
oct2476005
91256474
10687109
1142a265
12291771
131b0997
1413c593
15d88c4
hexa7c05

687109 has 2 divisors, whose sum is σ = 687110. Its totient is φ = 687108.

The previous prime is 687107. The next prime is 687121. The reversal of 687109 is 901786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 124609 = 750^2 + 353^2 .

It is a cyclic number.

It is not a de Polignac number, because 687109 - 21 = 687107 is a prime.

Together with 687107, 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 (687101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343554 + 343555.

It is an arithmetic number, because the mean of its divisors is an integer number (343555).

2687109 is an apocalyptic number.

It is an amenable number.

687109 is a deficient number, since it is larger than the sum of its proper divisors (1).

687109 is an equidigital number, since it uses as much as digits as its factorization.

687109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 687109 is about 828.9203821840. The cubic root of 687109 is about 88.2419734987.

The spelling of 687109 in words is "six hundred eighty-seven thousand, one hundred nine".