648239953 has 4 divisors (see below), whose sum is σ = 648292788. Its totient is φ = 648187120.

The previous prime is 648239923. The next prime is 648239959. The reversal of 648239953 is 359932846.

648239953 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 253701184 + 394538769 = 15928^2 + 19863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648239953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648239897 and 648239906.

It is not an unprimeable number, because it can be changed into a prime (648239959) 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, 2643 + ... + 36103.

It is an arithmetic number, because the mean of its divisors is an integer number (162073197).

Almost surely, 2^648239953 is an apocalyptic number.

It is an amenable number.

648239953 is a deficient number, since it is larger than the sum of its proper divisors (52835).

648239953 is a wasteful number, since it uses less digits than its factorization.

648239953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52834.

The product of its digits is 1399680, while the sum is 49.

The square root of 648239953 is about 25460.5568085225. The cubic root of 648239953 is about 865.4565413830.

The spelling of 648239953 in words is "six hundred forty-eight million, two hundred thirty-nine thousand, nine hundred fifty-three".