680491 has 4 divisors (see below), whose sum is σ = 777712. Its totient is φ = 583272.

The previous prime is 680489. The next prime is 680503. The reversal of 680491 is 194086.

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 680491 - 2¹ = 680489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680401) 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, 48600 + ... + 48613.

It is an arithmetic number, because the mean of its divisors is an integer number (194428).

2⁶⁸⁰⁴⁹¹ is an apocalyptic number.

680491 is a deficient number, since it is larger than the sum of its proper divisors (97221).

680491 is an equidigital number, since it uses as much as digits as its factorization.

680491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97220.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 680491 is about 824.9187838812. The cubic root of 680491 is about 87.9577534821.

The spelling of 680491 in words is "six hundred eighty thousand, four hundred ninety-one".