677321 has 2 divisors, whose sum is σ = 677322. Its totient is φ = 677320.

The previous prime is 677311. The next prime is 677323. The reversal of 677321 is 123776.

677321 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 can be written as a sum of positive squares in only one way, i.e., 657721 + 19600 = 811^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 677321 - 2¹⁰ = 676297 is a prime.

Together with 677323, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338660 + 338661.

It is an arithmetic number, because the mean of its divisors is an integer number (338661).

2⁶⁷⁷³²¹ is an apocalyptic number.

It is an amenable number.

677321 is a deficient number, since it is larger than the sum of its proper divisors (1).

677321 is an equidigital number, since it uses as much as digits as its factorization.

677321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 26.

The square root of 677321 is about 822.9951397183. The cubic root of 677321 is about 87.8209600179.

The spelling of 677321 in words is "six hundred seventy-seven thousand, three hundred twenty-one".