685031 has 2 divisors, whose sum is σ = 685032. Its totient is φ = 685030.

The previous prime is 685019. The next prime is 685039. The reversal of 685031 is 130586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685031 - 2¹⁰ = 684007 is a prime.

It is a super-2 number, since 2×685031² = 938534941922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 684988 and 685006.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685031.

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, 342515 + 342516.

It is an arithmetic number, because the mean of its divisors is an integer number (342516).

2⁶⁸⁵⁰³¹ is an apocalyptic number.

685031 is a deficient number, since it is larger than the sum of its proper divisors (1).

685031 is an equidigital number, since it uses as much as digits as its factorization.

685031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 685031 is about 827.6659954354. The cubic root of 685031 is about 88.1529279557.

The spelling of 685031 in words is "six hundred eighty-five thousand, thirty-one".