677214721 has 2 divisors, whose sum is σ = 677214722. Its totient is φ = 677214720.

The previous prime is 677214719. The next prime is 677214731. The reversal of 677214721 is 127412776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383572225 + 293642496 = 19585^2 + 17136^2 .

It is a cyclic number.

It is not a de Polignac number, because 677214721 - 2¹ = 677214719 is a prime.

Together with 677214719, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (677214731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338607360 + 338607361.

It is an arithmetic number, because the mean of its divisors is an integer number (338607361).

Almost surely, 2^677214721 is an apocalyptic number.

It is an amenable number.

677214721 is a deficient number, since it is larger than the sum of its proper divisors (1).

677214721 is an equidigital number, since it uses as much as digits as its factorization.

677214721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 37.

The square root of 677214721 is about 26023.3495346007. The cubic root of 677214721 is about 878.1636642441.

The spelling of 677214721 in words is "six hundred seventy-seven million, two hundred fourteen thousand, seven hundred twenty-one".