681319 has 4 divisors (see below), whose sum is σ = 684760. Its totient is φ = 677880.

The previous prime is 681311. The next prime is 681337. The reversal of 681319 is 913186.

It is a happy number.

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 681319 - 2³ = 681311 is a prime.

It is a super-2 number, since 2×681319² = 928391159522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681311) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1404 + ... + 1825.

It is an arithmetic number, because the mean of its divisors is an integer number (171190).

2⁶⁸¹³¹⁹ is an apocalyptic number.

681319 is a deficient number, since it is larger than the sum of its proper divisors (3441).

681319 is a wasteful number, since it uses less digits than its factorization.

681319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440.

The product of its digits is 1296, while the sum is 28.

The square root of 681319 is about 825.4204988974. The cubic root of 681319 is about 87.9934137633.

It can be divided in two parts, 681 and 319, that added together give a cube (1000 = 10³).

The spelling of 681319 in words is "six hundred eighty-one thousand, three hundred nineteen".