649265 has 4 divisors (see below), whose sum is σ = 779124. Its totient is φ = 519408.

The previous prime is 649261. The next prime is 649273. The reversal of 649265 is 562946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85264 + 564001 = 292^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 649265 - 2² = 649261 is a prime.

It is a Duffinian number.

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (649261) 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, 64922 + ... + 64931.

It is an arithmetic number, because the mean of its divisors is an integer number (194781).

2⁶⁴⁹²⁶⁵ is an apocalyptic number.

It is an amenable number.

649265 is a deficient number, since it is larger than the sum of its proper divisors (129859).

649265 is a wasteful number, since it uses less digits than its factorization.

649265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129858.

The product of its digits is 12960, while the sum is 32.

The square root of 649265 is about 805.7698182484. The cubic root of 649265 is about 86.5912476687.

The spelling of 649265 in words is "six hundred forty-nine thousand, two hundred sixty-five".