681494 has 8 divisors (see below), whose sum is σ = 1115208. Its totient is φ = 309760.

The previous prime is 681493. The next prime is 681497. The reversal of 681494 is 494186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 681494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681493) 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, 15467 + ... + 15510.

It is an arithmetic number, because the mean of its divisors is an integer number (139401).

2⁶⁸¹⁴⁹⁴ is an apocalyptic number.

681494 is a deficient number, since it is larger than the sum of its proper divisors (433714).

681494 is a wasteful number, since it uses less digits than its factorization.

681494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30990.

The product of its digits is 6912, while the sum is 32.

The square root of 681494 is about 825.5264986662. The cubic root of 681494 is about 88.0009469595. Note that the first 3 decimals are identical.

The spelling of 681494 in words is "six hundred eighty-one thousand, four hundred ninety-four".