680091 has 4 divisors (see below), whose sum is σ = 906792. Its totient is φ = 453392.

The previous prime is 680083. The next prime is 680107. The reversal of 680091 is 190086.

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 680091 - 2³ = 680083 is a prime.

It is a D-number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (680081) 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, 113346 + ... + 113351.

It is an arithmetic number, because the mean of its divisors is an integer number (226698).

2⁶⁸⁰⁰⁹¹ is an apocalyptic number.

680091 is a deficient number, since it is larger than the sum of its proper divisors (226701).

680091 is a wasteful number, since it uses less digits than its factorization.

680091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226700.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 680091 is about 824.6763001324. The cubic root of 680091 is about 87.9405159300.

The spelling of 680091 in words is "six hundred eighty thousand, ninety-one".