685492499 has 2 divisors, whose sum is σ = 685492500. Its totient is φ = 685492498.

The previous prime is 685492487. The next prime is 685492519. The reversal of 685492499 is 994294586.

It is a happy number.

685492499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685492499 is a prime.

It is not a weakly prime, because it can be changed into another prime (685492399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342746249 + 342746250.

It is an arithmetic number, because the mean of its divisors is an integer number (342746250).

Almost surely, 2^685492499 is an apocalyptic number.

685492499 is a deficient number, since it is larger than the sum of its proper divisors (1).

685492499 is an equidigital number, since it uses as much as digits as its factorization.

685492499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 56.

The square root of 685492499 is about 26181.9116758116. The cubic root of 685492499 is about 881.7271944721.

The spelling of 685492499 in words is "six hundred eighty-five million, four hundred ninety-two thousand, four hundred ninety-nine".