685993123 has 2 divisors, whose sum is σ = 685993124. Its totient is φ = 685993122.

The previous prime is 685993073. The next prime is 685993171. The reversal of 685993123 is 321399586.

It is a happy number.

685993123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685993123 - 2¹³ = 685984931 is a prime.

It is not a weakly prime, because it can be changed into another prime (685993223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342996561 + 342996562.

It is an arithmetic number, because the mean of its divisors is an integer number (342996562).

Almost surely, 2^685993123 is an apocalyptic number.

685993123 is a deficient number, since it is larger than the sum of its proper divisors (1).

685993123 is an equidigital number, since it uses as much as digits as its factorization.

685993123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 46.

The square root of 685993123 is about 26191.4704245485. The cubic root of 685993123 is about 881.9417878155.

The spelling of 685993123 in words is "six hundred eighty-five million, nine hundred ninety-three thousand, one hundred twenty-three".