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649813 is a prime number
BaseRepresentation
bin10011110101001010101
31020000101011
42132221111
5131243223
621532221
75344333
oct2365125
91200334
10649813
1140423a
12274071
13199a08
1412cb53
15cc80d
hex9ea55

649813 has 2 divisors, whose sum is σ = 649814. Its totient is φ = 649812.

The previous prime is 649801. The next prime is 649829. The reversal of 649813 is 318946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 580644 + 69169 = 762^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 649813 - 217 = 518741 is a prime.

649813 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649843) 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, 324906 + 324907.

It is an arithmetic number, because the mean of its divisors is an integer number (324907).

2649813 is an apocalyptic number.

It is an amenable number.

649813 is a deficient number, since it is larger than the sum of its proper divisors (1).

649813 is an equidigital number, since it uses as much as digits as its factorization.

649813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 649813 is about 806.1097940107. The cubic root of 649813 is about 86.6156027264.

The spelling of 649813 in words is "six hundred forty-nine thousand, eight hundred thirteen".