649001 has 2 divisors, whose sum is σ = 649002. Its totient is φ = 649000.

The previous prime is 648997. The next prime is 649007. The reversal of 649001 is 100946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 179776 = 685^2 + 424^2 .

It is a cyclic number.

It is not a de Polignac number, because 649001 - 2² = 648997 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649007) 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, 324500 + 324501.

It is an arithmetic number, because the mean of its divisors is an integer number (324501).

2⁶⁴⁹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

649001 is a deficient number, since it is larger than the sum of its proper divisors (1).

649001 is an equidigital number, since it uses as much as digits as its factorization.

649001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 649001 is about 805.6059830960. The cubic root of 649001 is about 86.5795096837.

Adding to 649001 its reverse (100946), we get a palindrome (749947).

The spelling of 649001 in words is "six hundred forty-nine thousand, one".