687071213 has 2 divisors, whose sum is σ = 687071214. Its totient is φ = 687071212.

The previous prime is 687071207. The next prime is 687071227. The reversal of 687071213 is 312170786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591559684 + 95511529 = 24322^2 + 9773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687071213 is a prime.

It is a super-3 number, since 3×687071213³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687071513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343535606 + 343535607.

It is an arithmetic number, because the mean of its divisors is an integer number (343535607).

Almost surely, 2^687071213 is an apocalyptic number.

It is an amenable number.

687071213 is a deficient number, since it is larger than the sum of its proper divisors (1).

687071213 is an equidigital number, since it uses as much as digits as its factorization.

687071213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 687071213 is about 26212.0432816673. The cubic root of 687071213 is about 882.4035587057.

The spelling of 687071213 in words is "six hundred eighty-seven million, seventy-one thousand, two hundred thirteen".