685019 has 2 divisors, whose sum is σ = 685020. Its totient is φ = 685018.

The previous prime is 685001. The next prime is 685031. The reversal of 685019 is 910586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685019 is a prime.

It is a super-2 number, since 2×685019² = 938502060722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 684982 and 685000.

It is not a weakly prime, because it can be changed into another prime (685039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342509 + 342510.

It is an arithmetic number, because the mean of its divisors is an integer number (342510).

2⁶⁸⁵⁰¹⁹ is an apocalyptic number.

685019 is a deficient number, since it is larger than the sum of its proper divisors (1).

685019 is an equidigital number, since it uses as much as digits as its factorization.

685019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 685019 is about 827.6587461025. The cubic root of 685019 is about 88.1524132143.

The spelling of 685019 in words is "six hundred eighty-five thousand, nineteen".