649193 has 4 divisors (see below), whose sum is σ = 653700. Its totient is φ = 644688.

The previous prime is 649183. The next prime is 649217. The reversal of 649193 is 391946.

649193 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 391946 = 2 ⋅195973.

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 222784 = 653^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 649193 - 2⁸ = 648937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649123) 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 in 3 ways as a sum of consecutive naturals, for example, 2030 + ... + 2327.

It is an arithmetic number, because the mean of its divisors is an integer number (163425).

2⁶⁴⁹¹⁹³ is an apocalyptic number.

It is an amenable number.

649193 is a deficient number, since it is larger than the sum of its proper divisors (4507).

649193 is a wasteful number, since it uses less digits than its factorization.

649193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506.

The product of its digits is 5832, while the sum is 32.

The square root of 649193 is about 805.7251392379. The cubic root of 649193 is about 86.5880467157.

The spelling of 649193 in words is "six hundred forty-nine thousand, one hundred ninety-three".