681279 has 4 divisors (see below), whose sum is σ = 908376. Its totient is φ = 454184.

The previous prime is 681271. The next prime is 681293. The reversal of 681279 is 972186.

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 681279 - 2³ = 681271 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681271) 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, 113544 + ... + 113549.

It is an arithmetic number, because the mean of its divisors is an integer number (227094).

2⁶⁸¹²⁷⁹ is an apocalyptic number.

681279 is a deficient number, since it is larger than the sum of its proper divisors (227097).

681279 is a wasteful number, since it uses less digits than its factorization.

681279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227096.

The product of its digits is 6048, while the sum is 33.

The square root of 681279 is about 825.3962684675. The cubic root of 681279 is about 87.9916917087.

The spelling of 681279 in words is "six hundred eighty-one thousand, two hundred seventy-nine".