654643 has 4 divisors (see below), whose sum is σ = 714168. Its totient is φ = 595120.

The previous prime is 654629. The next prime is 654671. The reversal of 654643 is 346456.

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

It is a cyclic number.

It is not a de Polignac number, because 654643 - 2⁵ = 654611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29746 + ... + 29767.

It is an arithmetic number, because the mean of its divisors is an integer number (178542).

2⁶⁵⁴⁶⁴³ is an apocalyptic number.

654643 is a deficient number, since it is larger than the sum of its proper divisors (59525).

654643 is a wasteful number, since it uses less digits than its factorization.

654643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59524.

The product of its digits is 8640, while the sum is 28.

The square root of 654643 is about 809.1001174144. The cubic root of 654643 is about 86.8296751303.

The spelling of 654643 in words is "six hundred fifty-four thousand, six hundred forty-three".