648191 has 2 divisors, whose sum is σ = 648192. Its totient is φ = 648190.

The previous prime is 648181. The next prime is 648199. The reversal of 648191 is 191846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648191 - 2¹⁸ = 386047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324095 + 324096.

It is an arithmetic number, because the mean of its divisors is an integer number (324096).

2⁶⁴⁸¹⁹¹ is an apocalyptic number.

648191 is a deficient number, since it is larger than the sum of its proper divisors (1).

648191 is an equidigital number, since it uses as much as digits as its factorization.

648191 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 648191 is about 805.1030989879. The cubic root of 648191 is about 86.5434755335.

The spelling of 648191 in words is "six hundred forty-eight thousand, one hundred ninety-one".