681379 has 4 divisors (see below), whose sum is σ = 698040. Its totient is φ = 664720.

The previous prime is 681371. The next prime is 681403. The reversal of 681379 is 973186.

681379 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.

It is a cyclic number.

It is not a de Polignac number, because 681379 - 2³ = 681371 is a prime.

It is a Duffinian number.

681379 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (681371) 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, 8269 + ... + 8350.

It is an arithmetic number, because the mean of its divisors is an integer number (174510).

2⁶⁸¹³⁷⁹ is an apocalyptic number.

681379 is a deficient number, since it is larger than the sum of its proper divisors (16661).

681379 is a wasteful number, since it uses less digits than its factorization.

681379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16660.

The product of its digits is 9072, while the sum is 34.

The square root of 681379 is about 825.4568432087. The cubic root of 681379 is about 87.9959967187.

The spelling of 681379 in words is "six hundred eighty-one thousand, three hundred seventy-nine".