680559091 has 4 divisors (see below), whose sum is σ = 685917952. Its totient is φ = 675200232.

The previous prime is 680559083. The next prime is 680559101. The reversal of 680559091 is 190955086.

It is a happy number.

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 680559091 - 2³ = 680559083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680559391) 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, 2679240 + ... + 2679493.

It is an arithmetic number, because the mean of its divisors is an integer number (171479488).

Almost surely, 2^680559091 is an apocalyptic number.

680559091 is a deficient number, since it is larger than the sum of its proper divisors (5358861).

680559091 is a wasteful number, since it uses less digits than its factorization.

680559091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358860.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 680559091 is about 26087.5274987876. The cubic root of 680559091 is about 879.6068711467.

The spelling of 680559091 in words is "six hundred eighty million, five hundred fifty-nine thousand, ninety-one".