648221185 has 8 divisors (see below), whose sum is σ = 780175656. Its totient is φ = 517036800.

The previous prime is 648221179. The next prime is 648221201. The reversal of 648221185 is 581122846.

It can be written as a sum of positive squares in 4 ways, for example, as 27164944 + 621056241 = 5212^2 + 24921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 648221185 - 2¹⁹ = 647696897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190666 + ... + 194035.

It is an arithmetic number, because the mean of its divisors is an integer number (97521957).

Almost surely, 2^648221185 is an apocalyptic number.

It is an amenable number.

648221185 is a deficient number, since it is larger than the sum of its proper divisors (131954471).

648221185 is a wasteful number, since it uses less digits than its factorization.

648221185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385043.

The product of its digits is 30720, while the sum is 37.

The square root of 648221185 is about 25460.1882357535. The cubic root of 648221185 is about 865.4481890000.

The spelling of 648221185 in words is "six hundred forty-eight million, two hundred twenty-one thousand, one hundred eighty-five".