649263 has 4 divisors (see below), whose sum is σ = 865688. Its totient is φ = 432840.

The previous prime is 649261. The next prime is 649273. The reversal of 649263 is 362946.

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

It is not a de Polignac number, because 649263 - 2¹ = 649261 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649261) 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 in 3 ways as a sum of consecutive naturals, for example, 108208 + ... + 108213.

It is an arithmetic number, because the mean of its divisors is an integer number (216422).

2⁶⁴⁹²⁶³ is an apocalyptic number.

649263 is a deficient number, since it is larger than the sum of its proper divisors (216425).

649263 is a wasteful number, since it uses less digits than its factorization.

649263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216424.

The product of its digits is 7776, while the sum is 30.

The square root of 649263 is about 805.7685771982. The cubic root of 649263 is about 86.5911587565.

It can be divided in two parts, 6492 and 63, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 649263 in words is "six hundred forty-nine thousand, two hundred sixty-three".