681304579 has 4 divisors (see below), whose sum is σ = 682291240. Its totient is φ = 680317920.

The previous prime is 681304571. The next prime is 681304607. The reversal of 681304579 is 975403186.

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 681304579 - 2³ = 681304571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681304571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492294 + ... + 493675.

It is an arithmetic number, because the mean of its divisors is an integer number (170572810).

Almost surely, 2^681304579 is an apocalyptic number.

681304579 is a deficient number, since it is larger than the sum of its proper divisors (986661).

681304579 is an equidigital number, since it uses as much as digits as its factorization.

681304579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986660.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 681304579 is about 26101.8117953524. The cubic root of 681304579 is about 879.9279292733.

The spelling of 681304579 in words is "six hundred eighty-one million, three hundred four thousand, five hundred seventy-nine".