686605043 has 2 divisors, whose sum is σ = 686605044. Its totient is φ = 686605042.

The previous prime is 686605021. The next prime is 686605057. The reversal of 686605043 is 340506686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686605043 - 2¹⁶ = 686539507 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 686604988 and 686605006.

It is not a weakly prime, because it can be changed into another prime (686605013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343302521 + 343302522.

It is an arithmetic number, because the mean of its divisors is an integer number (343302522).

Almost surely, 2^686605043 is an apocalyptic number.

686605043 is a deficient number, since it is larger than the sum of its proper divisors (1).

686605043 is an equidigital number, since it uses as much as digits as its factorization.

686605043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 686605043 is about 26203.1494862736. The cubic root of 686605043 is about 882.2039466294.

The spelling of 686605043 in words is "six hundred eighty-six million, six hundred five thousand, forty-three".