646545 has 8 divisors (see below), whose sum is σ = 1034496. Its totient is φ = 344816.

The previous prime is 646543. The next prime is 646549. The reversal of 646545 is 545646.

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 646545 - 2¹ = 646543 is a prime.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646545.

It is not an unprimeable number, because it can be changed into a prime (646543) 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, 21537 + ... + 21566.

It is an arithmetic number, because the mean of its divisors is an integer number (129312).

2⁶⁴⁶⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

646545 is a deficient number, since it is larger than the sum of its proper divisors (387951).

646545 is a wasteful number, since it uses less digits than its factorization.

646545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43111.

The product of its digits is 14400, while the sum is 30.

The square root of 646545 is about 804.0802198786. The cubic root of 646545 is about 86.4701579930.

The spelling of 646545 in words is "six hundred forty-six thousand, five hundred forty-five".