686589793 has 2 divisors, whose sum is σ = 686589794. Its totient is φ = 686589792.

The previous prime is 686589781. The next prime is 686589811. The reversal of 686589793 is 397985686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522442449 + 164147344 = 22857^2 + 12812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686589793 is a prime.

It is not a weakly prime, because it can be changed into another prime (686589713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343294896 + 343294897.

It is an arithmetic number, because the mean of its divisors is an integer number (343294897).

Almost surely, 2^686589793 is an apocalyptic number.

It is an amenable number.

686589793 is a deficient number, since it is larger than the sum of its proper divisors (1).

686589793 is an equidigital number, since it uses as much as digits as its factorization.

686589793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 61.

The square root of 686589793 is about 26202.8584891038. The cubic root of 686589793 is about 882.1974151162.

The spelling of 686589793 in words is "six hundred eighty-six million, five hundred eighty-nine thousand, seven hundred ninety-three".