648454941289 has 3 divisors (see below), whose sum is σ = 648455746557. Its totient is φ = 648454136022.

The previous prime is 648454941271. The next prime is 648454941311. The reversal of 648454941289 is 982149454846.

The square root of 648454941289 is 805267.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 648454941289 - 2¹¹ = 648454939241 is a prime.

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 648454941289.

It is not an unprimeable number, because it can be changed into a prime (648454941259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 402634 + ... + 1207900.

It is an arithmetic number, because the mean of its divisors is an integer number (216151915519).

Almost surely, 2^648454941289 is an apocalyptic number.

648454941289 is the 805267-th square number.

648454941289 is the 402634-th centered octagonal number.

It is an amenable number.

648454941289 is a deficient number, since it is larger than the sum of its proper divisors (805268).

648454941289 is an frugal number, since it uses more digits than its factorization.

648454941289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610534 (or 805267 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 64.

Multiplying 648454941289 by its sum of digits (64), we get a square (41501116242496 = 6442136²).

The spelling of 648454941289 in words is "six hundred forty-eight billion, four hundred fifty-four million, nine hundred forty-one thousand, two hundred eighty-nine".