648121823 has 8 divisors (see below), whose sum is σ = 654151680. Its totient is φ = 642117880.

The previous prime is 648121819. The next prime is 648121829. The reversal of 648121823 is 328121846.

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 648121823 - 2² = 648121819 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 (648121829) 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 7 ways as a sum of consecutive naturals, for example, 45698 + ... + 58176.

It is an arithmetic number, because the mean of its divisors is an integer number (81768960).

Almost surely, 2^648121823 is an apocalyptic number.

648121823 is a deficient number, since it is larger than the sum of its proper divisors (6029857).

648121823 is a wasteful number, since it uses less digits than its factorization.

648121823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12957.

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

The square root of 648121823 is about 25458.2368399699. The cubic root of 648121823 is about 865.4039669252.

The spelling of 648121823 in words is "six hundred forty-eight million, one hundred twenty-one thousand, eight hundred twenty-three".