680342581 has 4 divisors (see below), whose sum is σ = 703802700. Its totient is φ = 656882464.

The previous prime is 680342543. The next prime is 680342623. The reversal of 680342581 is 185243086.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 457318225 + 223024356 = 21385^2 + 14934^2 .

It is a cyclic number.

It is not a de Polignac number, because 680342581 - 2¹⁷ = 680211509 is a prime.

It is a super-2 number, since 2×680342581² = 925732055043483122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680342581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680342681) 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, 11730016 + ... + 11730073.

It is an arithmetic number, because the mean of its divisors is an integer number (175950675).

Almost surely, 2^680342581 is an apocalyptic number.

It is an amenable number.

680342581 is a deficient number, since it is larger than the sum of its proper divisors (23460119).

680342581 is a wasteful number, since it uses less digits than its factorization.

680342581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23460118.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 680342581 is about 26083.3774845207. The cubic root of 680342581 is about 879.5135831989.

The spelling of 680342581 in words is "six hundred eighty million, three hundred forty-two thousand, five hundred eighty-one".