648322501 has 4 divisors (see below), whose sum is σ = 649567404. Its totient is φ = 647077600.

The previous prime is 648322487. The next prime is 648322531. The reversal of 648322501 is 105223846.

648322501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 480749476 + 167573025 = 21926^2 + 12945^2 .

It is a cyclic number.

It is not a de Polignac number, because 648322501 - 2¹⁹ = 647798213 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648322531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621670 + ... + 622711.

It is an arithmetic number, because the mean of its divisors is an integer number (162391851).

Almost surely, 2^648322501 is an apocalyptic number.

It is an amenable number.

648322501 is a deficient number, since it is larger than the sum of its proper divisors (1244903).

648322501 is a wasteful number, since it uses less digits than its factorization.

648322501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244902.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 648322501 is about 25462.1778526504. The cubic root of 648322501 is about 865.4932760695.

The spelling of 648322501 in words is "six hundred forty-eight million, three hundred twenty-two thousand, five hundred one".