648221183 has 4 divisors (see below), whose sum is σ = 648468720. Its totient is φ = 647973648.

The previous prime is 648221179. The next prime is 648221201. The reversal of 648221183 is 381122846.

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

It is a cyclic number.

It is not a de Polignac number, because 648221183 - 2² = 648221179 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648221383) by changing a digit.

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, 119798 + ... + 125091.

It is an arithmetic number, because the mean of its divisors is an integer number (162117180).

Almost surely, 2^648221183 is an apocalyptic number.

648221183 is a deficient number, since it is larger than the sum of its proper divisors (247537).

648221183 is a wasteful number, since it uses less digits than its factorization.

648221183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247536.

The product of its digits is 18432, while the sum is 35.

The square root of 648221183 is about 25460.1881964765. The cubic root of 648221183 is about 865.4481881099.

The spelling of 648221183 in words is "six hundred forty-eight million, two hundred twenty-one thousand, one hundred eighty-three".