649567 has 2 divisors, whose sum is σ = 649568. Its totient is φ = 649566.

The previous prime is 649559. The next prime is 649573. The reversal of 649567 is 765946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649567 - 2³ = 649559 is a prime.

It is a Chen prime.

649567 is a lucky number.

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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324783 + 324784.

It is an arithmetic number, because the mean of its divisors is an integer number (324784).

2⁶⁴⁹⁵⁶⁷ is an apocalyptic number.

649567 is a deficient number, since it is larger than the sum of its proper divisors (1).

649567 is an equidigital number, since it uses as much as digits as its factorization.

649567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 649567 is about 805.9571948931. The cubic root of 649567 is about 86.6046713110.

The spelling of 649567 in words is "six hundred forty-nine thousand, five hundred sixty-seven".