681206 has 12 divisors (see below), whose sum is σ = 1057452. Its totient is φ = 328944.

The previous prime is 681179. The next prime is 681221. The reversal of 681206 is 602186.

It is a super-2 number, since 2×681206² = 928083228872, which contains 22 as substring.

It is an Ulam number.

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 681206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7610 + ... + 7698.

It is an arithmetic number, because the mean of its divisors is an integer number (88121).

2⁶⁸¹²⁰⁶ is an apocalyptic number.

681206 is a deficient number, since it is larger than the sum of its proper divisors (376246).

681206 is an equidigital number, since it uses as much as digits as its factorization.

681206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 681206 is about 825.3520460991. The cubic root of 681206 is about 87.9885487854.

The spelling of 681206 in words is "six hundred eighty-one thousand, two hundred six".