648997 has 2 divisors, whose sum is σ = 648998. Its totient is φ = 648996.

The previous prime is 648971. The next prime is 649001. The reversal of 648997 is 799846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641601 + 7396 = 801^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 648997 - 2¹⁵ = 616229 is a 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324498 + 324499.

It is an arithmetic number, because the mean of its divisors is an integer number (324499).

2⁶⁴⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

648997 is a deficient number, since it is larger than the sum of its proper divisors (1).

648997 is an equidigital number, since it uses as much as digits as its factorization.

648997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 648997 is about 805.6035004889. The cubic root of 648997 is about 86.5793318110.

The spelling of 648997 in words is "six hundred forty-eight thousand, nine hundred ninety-seven".