681243 has 4 divisors (see below), whose sum is σ = 908328. Its totient is φ = 454160.

The previous prime is 681229. The next prime is 681251. The reversal of 681243 is 342186.

It is a happy number.

681243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 681243 - 2⁶ = 681179 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (681253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113538 + ... + 113543.

It is an arithmetic number, because the mean of its divisors is an integer number (227082).

2⁶⁸¹²⁴³ is an apocalyptic number.

681243 is a deficient number, since it is larger than the sum of its proper divisors (227085).

681243 is a wasteful number, since it uses less digits than its factorization.

681243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227084.

The product of its digits is 1152, while the sum is 24.

The square root of 681243 is about 825.3744604723. The cubic root of 681243 is about 87.9901418020.

The spelling of 681243 in words is "six hundred eighty-one thousand, two hundred forty-three".