649501 has 2 divisors, whose sum is σ = 649502. Its totient is φ = 649500.

The previous prime is 649499. The next prime is 649507. The reversal of 649501 is 105946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348100 + 301401 = 590^2 + 549^2 .

It is a cyclic number.

It is not a de Polignac number, because 649501 - 2¹ = 649499 is a prime.

Together with 649499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649507) 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, 324750 + 324751.

It is an arithmetic number, because the mean of its divisors is an integer number (324751).

2⁶⁴⁹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

649501 is a deficient number, since it is larger than the sum of its proper divisors (1).

649501 is an equidigital number, since it uses as much as digits as its factorization.

649501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 649501 is about 805.9162487505. The cubic root of 649501 is about 86.6017380226.

The spelling of 649501 in words is "six hundred forty-nine thousand, five hundred one".