649849 has 2 divisors, whose sum is σ = 649850. Its totient is φ = 649848.

The previous prime is 649843. The next prime is 649867. The reversal of 649849 is 948946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 589824 + 60025 = 768^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324924 + 324925.

It is an arithmetic number, because the mean of its divisors is an integer number (324925).

2⁶⁴⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

649849 is a deficient number, since it is larger than the sum of its proper divisors (1).

649849 is an equidigital number, since it uses as much as digits as its factorization.

649849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 649849 is about 806.1321231659. The cubic root of 649849 is about 86.6172022143.

The spelling of 649849 in words is "six hundred forty-nine thousand, eight hundred forty-nine".