677221 has 4 divisors (see below), whose sum is σ = 686572. Its totient is φ = 667872.

The previous prime is 677213. The next prime is 677227. The reversal of 677221 is 122776.

677221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 474721 + 202500 = 689^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 677221 - 2³ = 677213 is a prime.

It is a Duffinian number.

677221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677227) 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, 4566 + ... + 4711.

It is an arithmetic number, because the mean of its divisors is an integer number (171643).

2⁶⁷⁷²²¹ is an apocalyptic number.

It is an amenable number.

677221 is a deficient number, since it is larger than the sum of its proper divisors (9351).

677221 is an equidigital number, since it uses as much as digits as its factorization.

677221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9350.

The product of its digits is 1176, while the sum is 25.

The square root of 677221 is about 822.9343837755. The cubic root of 677221 is about 87.8166378289.

Adding to 677221 its reverse (122776), we get a palindrome (799997).

It can be divided in two parts, 677 and 221, that added together give a palindrome (898).

The spelling of 677221 in words is "six hundred seventy-seven thousand, two hundred twenty-one".