648911 has 2 divisors, whose sum is σ = 648912. Its totient is φ = 648910.

The previous prime is 648889. The next prime is 648917. The reversal of 648911 is 119846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648911 is a prime.

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 (648917) 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, 324455 + 324456.

It is an arithmetic number, because the mean of its divisors is an integer number (324456).

2⁶⁴⁸⁹¹¹ is an apocalyptic number.

648911 is a deficient number, since it is larger than the sum of its proper divisors (1).

648911 is an equidigital number, since it uses as much as digits as its factorization.

648911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 648911 is about 805.5501225870. The cubic root of 648911 is about 86.5755073704.

The spelling of 648911 in words is "six hundred forty-eight thousand, nine hundred eleven".