686209499 has 2 divisors, whose sum is σ = 686209500. Its totient is φ = 686209498.

The previous prime is 686209483. The next prime is 686209547. The reversal of 686209499 is 994902686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686209499 - 2⁴ = 686209483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686209499.

It is not a weakly prime, because it can be changed into another prime (686209409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343104749 + 343104750.

It is an arithmetic number, because the mean of its divisors is an integer number (343104750).

Almost surely, 2^686209499 is an apocalyptic number.

686209499 is a deficient number, since it is larger than the sum of its proper divisors (1).

686209499 is an equidigital number, since it uses as much as digits as its factorization.

686209499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The square root of 686209499 is about 26195.6007566156. The cubic root of 686209499 is about 882.0345054485.

The spelling of 686209499 in words is "six hundred eighty-six million, two hundred nine thousand, four hundred ninety-nine".