680651 has 2 divisors, whose sum is σ = 680652. Its totient is φ = 680650.

The previous prime is 680633. The next prime is 680657. The reversal of 680651 is 156086.

680651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680651 - 2⁶ = 680587 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680651.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680651.

It is not a weakly prime, because it can be changed into another prime (680657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340325 + 340326.

It is an arithmetic number, because the mean of its divisors is an integer number (340326).

2⁶⁸⁰⁶⁵¹ is an apocalyptic number.

680651 is a deficient number, since it is larger than the sum of its proper divisors (1).

680651 is an equidigital number, since it uses as much as digits as its factorization.

680651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 680651 is about 825.0157574253. The cubic root of 680651 is about 87.9646466116.

Subtracting from 680651 its sum of digits (26), we obtain a square (680625 = 825²).

It can be divided in two parts, 680 and 651, that added together give a palindrome (1331).

The spelling of 680651 in words is "six hundred eighty thousand, six hundred fifty-one".