681286 has 4 divisors (see below), whose sum is σ = 1021932. Its totient is φ = 340642.

The previous prime is 681271. The next prime is 681293. The reversal of 681286 is 682186.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×681286² = 928301227592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170320 + ... + 170323.

It is an arithmetic number, because the mean of its divisors is an integer number (255483).

2⁶⁸¹²⁸⁶ is an apocalyptic number.

681286 is a deficient number, since it is larger than the sum of its proper divisors (340646).

681286 is a wasteful number, since it uses less digits than its factorization.

681286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340645.

The product of its digits is 4608, while the sum is 31.

The square root of 681286 is about 825.4005088440. The cubic root of 681286 is about 87.9919930731.

Subtracting 681286 from its reverse (682186), we obtain a square (900 = 30²).

The spelling of 681286 in words is "six hundred eighty-one thousand, two hundred eighty-six".