686650873 has 2 divisors, whose sum is σ = 686650874. Its totient is φ = 686650872.

The previous prime is 686650843. The next prime is 686650897. The reversal of 686650873 is 378056686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 682933689 + 3717184 = 26133^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 686650873 - 2¹³ = 686642681 is a prime.

It is not a weakly prime, because it can be changed into another prime (686650813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343325436 + 343325437.

It is an arithmetic number, because the mean of its divisors is an integer number (343325437).

Almost surely, 2^686650873 is an apocalyptic number.

It is an amenable number.

686650873 is a deficient number, since it is larger than the sum of its proper divisors (1).

686650873 is an equidigital number, since it uses as much as digits as its factorization.

686650873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 686650873 is about 26204.0239848768. The cubic root of 686650873 is about 882.2235748508.

The spelling of 686650873 in words is "six hundred eighty-six million, six hundred fifty thousand, eight hundred seventy-three".