648719 has 2 divisors, whose sum is σ = 648720. Its totient is φ = 648718.

The previous prime is 648709. The next prime is 648731. The reversal of 648719 is 917846.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648719 is a prime.

It is a super-2 number, since 2×648719² = 841672681922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324359 + 324360.

It is an arithmetic number, because the mean of its divisors is an integer number (324360).

2⁶⁴⁸⁷¹⁹ is an apocalyptic number.

648719 is a deficient number, since it is larger than the sum of its proper divisors (1).

648719 is an equidigital number, since it uses as much as digits as its factorization.

648719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 648719 is about 805.4309405529. The cubic root of 648719 is about 86.5669678649.

The spelling of 648719 in words is "six hundred forty-eight thousand, seven hundred nineteen".