648948521 has 8 divisors (see below), whose sum is σ = 699150144. Its totient is φ = 598787280.

The previous prime is 648948467. The next prime is 648948529. The reversal of 648948521 is 125849846.

648948521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-648948521 is a prime.

It is a super-2 number, since 2×648948521² = 842268365816174882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648948529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28886 + ... + 46176.

It is an arithmetic number, because the mean of its divisors is an integer number (87393768).

Almost surely, 2^648948521 is an apocalyptic number.

It is an amenable number.

648948521 is a deficient number, since it is larger than the sum of its proper divisors (50201623).

648948521 is a wasteful number, since it uses less digits than its factorization.

648948521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20191.

The product of its digits is 552960, while the sum is 47.

The square root of 648948521 is about 25474.4680219234. The cubic root of 648948521 is about 865.7717597978.

The spelling of 648948521 in words is "six hundred forty-eight million, nine hundred forty-eight thousand, five hundred twenty-one".