654528505 has 4 divisors (see below), whose sum is σ = 785434212. Its totient is φ = 523622800.

The previous prime is 654528493. The next prime is 654528559. The reversal of 654528505 is 505825456.

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

It can be written as a sum of positive squares in 2 ways, for example, as 360886009 + 293642496 = 18997^2 + 17136^2 .

It is not a de Polignac number, because 654528505 - 2⁷ = 654528377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65452846 + ... + 65452855.

It is an arithmetic number, because the mean of its divisors is an integer number (196358553).

Almost surely, 2^654528505 is an apocalyptic number.

It is an amenable number.

654528505 is a deficient number, since it is larger than the sum of its proper divisors (130905707).

654528505 is a wasteful number, since it uses less digits than its factorization.

654528505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130905706.

The product of its (nonzero) digits is 240000, while the sum is 40.

The square root of 654528505 is about 25583.7547087991. The cubic root of 654528505 is about 868.2461275625.

The spelling of 654528505 in words is "six hundred fifty-four million, five hundred twenty-eight thousand, five hundred five".