649013 has 4 divisors (see below), whose sum is σ = 651948. Its totient is φ = 646080.

The previous prime is 649007. The next prime is 649039. The reversal of 649013 is 310946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310946 = 2 ⋅155473.

It can be written as a sum of positive squares in 2 ways, for example, as 380689 + 268324 = 617^2 + 518^2 .

It is a cyclic number.

It is not a de Polignac number, because 649013 - 2⁴ = 648997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 649013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106 + ... + 1587.

It is an arithmetic number, because the mean of its divisors is an integer number (162987).

2⁶⁴⁹⁰¹³ is an apocalyptic number.

It is an amenable number.

649013 is a deficient number, since it is larger than the sum of its proper divisors (2935).

649013 is a wasteful number, since it uses less digits than its factorization.

649013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 649013 is about 805.6134308712. The cubic root of 649013 is about 86.5800432975.

Adding to 649013 its reverse (310946), we get a palindrome (959959).

The spelling of 649013 in words is "six hundred forty-nine thousand, thirteen".