681393 has 4 divisors (see below), whose sum is σ = 908528. Its totient is φ = 454260.

The previous prime is 681371. The next prime is 681403. The reversal of 681393 is 393186.

681393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 681393 - 2⁵ = 681361 is a prime.

It is a D-number.

It is a Duffinian number.

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 681393.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681393.

It is not an unprimeable number, because it can be changed into a prime (681293) 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, 113563 + ... + 113568.

It is an arithmetic number, because the mean of its divisors is an integer number (227132).

2⁶⁸¹³⁹³ is an apocalyptic number.

It is an amenable number.

681393 is a deficient number, since it is larger than the sum of its proper divisors (227135).

681393 is a wasteful number, since it uses less digits than its factorization.

681393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227134.

The product of its digits is 3888, while the sum is 30.

The square root of 681393 is about 825.4653233177. The cubic root of 681393 is about 87.9965993865.

The spelling of 681393 in words is "six hundred eighty-one thousand, three hundred ninety-three".