681013 has 4 divisors (see below), whose sum is σ = 682668. Its totient is φ = 679360.

The previous prime is 681011. The next prime is 681019. The reversal of 681013 is 310186.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 77284 + 603729 = 278^2 + 777^2 .

It is a cyclic number.

It is not a de Polignac number, because 681013 - 2¹ = 681011 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681011) 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, 333 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (170667).

2⁶⁸¹⁰¹³ is an apocalyptic number.

It is an amenable number.

681013 is a deficient number, since it is larger than the sum of its proper divisors (1655).

681013 is an equidigital number, since it uses as much as digits as its factorization.

681013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 681013 is about 825.2351180118. The cubic root of 681013 is about 87.9802383312.

Adding to 681013 its reverse (310186), we get a palindrome (991199).

It can be divided in two parts, 68 and 1013, that added together give a triangular number (1081 = T₄₆).

The spelling of 681013 in words is "six hundred eighty-one thousand, thirteen".