681298 has 4 divisors (see below), whose sum is σ = 1021950. Its totient is φ = 340648.

The previous prime is 681293. The next prime is 681311. The reversal of 681298 is 892186.

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

It can be written as a sum of positive squares in only one way, i.e., 677329 + 3969 = 823^2 + 63^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (681293) by changing a digit.

681298 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170323 + ... + 170326.

2⁶⁸¹²⁹⁸ is an apocalyptic number.

681298 is a deficient number, since it is larger than the sum of its proper divisors (340652).

681298 is a wasteful number, since it uses less digits than its factorization.

681298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340651.

The product of its digits is 6912, while the sum is 34.

The square root of 681298 is about 825.4077780104. The cubic root of 681298 is about 87.9925096930.

It can be divided in two parts, 681 and 298, that added together give a palindrome (979).

The spelling of 681298 in words is "six hundred eighty-one thousand, two hundred ninety-eight".