649937 has 2 divisors, whose sum is σ = 649938. Its totient is φ = 649936.

The previous prime is 649921. The next prime is 649969. The reversal of 649937 is 739946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 108241 = 736^2 + 329^2 .

It is a cyclic number.

It is not a de Polignac number, because 649937 - 2⁴ = 649921 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649937.

It is not a weakly prime, because it can be changed into another prime (649907) 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, 324968 + 324969.

It is an arithmetic number, because the mean of its divisors is an integer number (324969).

2⁶⁴⁹⁹³⁷ is an apocalyptic number.

It is an amenable number.

649937 is a deficient number, since it is larger than the sum of its proper divisors (1).

649937 is an equidigital number, since it uses as much as digits as its factorization.

649937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 649937 is about 806.1867029417. The cubic root of 649937 is about 86.6211118250.

Subtracting 649937 from its reverse (739946), we obtain a palindrome (90009).

It can be divided in two parts, 64 and 9937, that added together give a palindrome (10001).

The spelling of 649937 in words is "six hundred forty-nine thousand, nine hundred thirty-seven".