681313 has 4 divisors (see below), whose sum is σ = 683200. Its totient is φ = 679428.

The previous prime is 681311. The next prime is 681337. The reversal of 681313 is 313186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 313186 = 2 ⋅156593.

It is a cyclic number.

It is not a de Polignac number, because 681313 - 2¹ = 681311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681311) 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, 213 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (170800).

2⁶⁸¹³¹³ is an apocalyptic number.

It is an amenable number.

681313 is a deficient number, since it is larger than the sum of its proper divisors (1887).

681313 is a wasteful number, since it uses less digits than its factorization.

681313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886.

The product of its digits is 432, while the sum is 22.

The square root of 681313 is about 825.4168643782. The cubic root of 681313 is about 87.9931554594.

Adding to 681313 its reverse (313186), we get a palindrome (994499).

The spelling of 681313 in words is "six hundred eighty-one thousand, three hundred thirteen".