649543 has 8 divisors (see below), whose sum is σ = 700416. Its totient is φ = 600600.

The previous prime is 649541. The next prime is 649559. The reversal of 649543 is 345946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649543 - 2¹ = 649541 is a prime.

It is a super-2 number, since 2×649543² = 843812217698, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649541) 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 7 ways as a sum of consecutive naturals, for example, 258 + ... + 1168.

It is an arithmetic number, because the mean of its divisors is an integer number (87552).

2⁶⁴⁹⁵⁴³ is an apocalyptic number.

649543 is a deficient number, since it is larger than the sum of its proper divisors (50873).

649543 is a wasteful number, since it uses less digits than its factorization.

649543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its digits is 12960, while the sum is 31.

The square root of 649543 is about 805.9423056274. The cubic root of 649543 is about 86.6036046837.

The spelling of 649543 in words is "six hundred forty-nine thousand, five hundred forty-three".