649543893 has 4 divisors (see below), whose sum is σ = 866058528. Its totient is φ = 433029260.

The previous prime is 649543859. The next prime is 649543903. The reversal of 649543893 is 398345946.

649543893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649543893 - 2⁹ = 649543381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649543693) 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, 108257313 + ... + 108257318.

It is an arithmetic number, because the mean of its divisors is an integer number (216514632).

Almost surely, 2^649543893 is an apocalyptic number.

It is an amenable number.

649543893 is a deficient number, since it is larger than the sum of its proper divisors (216514635).

649543893 is a wasteful number, since it uses less digits than its factorization.

649543893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216514634.

The product of its digits is 2799360, while the sum is 51.

The square root of 649543893 is about 25486.1510040257. The cubic root of 649543893 is about 866.0364437156.

The spelling of 649543893 in words is "six hundred forty-nine million, five hundred forty-three thousand, eight hundred ninety-three".