677997217 has 2 divisors, whose sum is σ = 677997218. Its totient is φ = 677997216.

The previous prime is 677997193. The next prime is 677997223. The reversal of 677997217 is 712799776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 659256976 + 18740241 = 25676^2 + 4329^2 .

It is a cyclic number.

It is not a de Polignac number, because 677997217 - 2¹¹ = 677995169 is a prime.

It is not a weakly prime, because it can be changed into another prime (677997277) 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, 338998608 + 338998609.

It is an arithmetic number, because the mean of its divisors is an integer number (338998609).

Almost surely, 2^677997217 is an apocalyptic number.

It is an amenable number.

677997217 is a deficient number, since it is larger than the sum of its proper divisors (1).

677997217 is an equidigital number, since it uses as much as digits as its factorization.

677997217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2333772, while the sum is 55.

The square root of 677997217 is about 26038.3796922927. The cubic root of 677997217 is about 878.5017623592.

The spelling of 677997217 in words is "six hundred seventy-seven million, nine hundred ninety-seven thousand, two hundred seventeen".