654478109 has 8 divisors (see below), whose sum is σ = 663034680. Its totient is φ = 645958656.

The previous prime is 654478093. The next prime is 654478129. The reversal of 654478109 is 901874456.

It can be written as a sum of positive squares in 4 ways, for example, as 228674884 + 425803225 = 15122^2 + 20635^2 .

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 654478109 - 2⁴ = 654478093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 654478109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654478129) 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 7 ways as a sum of consecutive naturals, for example, 27137 + ... + 45225.

It is an arithmetic number, because the mean of its divisors is an integer number (82879335).

Almost surely, 2^654478109 is an apocalyptic number.

It is an amenable number.

654478109 is a deficient number, since it is larger than the sum of its proper divisors (8556571).

654478109 is a wasteful number, since it uses less digits than its factorization.

654478109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18559.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 654478109 is about 25582.7697679512. The cubic root of 654478109 is about 868.2238431982.

The spelling of 654478109 in words is "six hundred fifty-four million, four hundred seventy-eight thousand, one hundred nine".