648366949 has 4 divisors (see below), whose sum is σ = 670724460. Its totient is φ = 626009440.

The previous prime is 648366937. The next prime is 648367009. The reversal of 648366949 is 949663846.

648366949 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 460402849 + 187964100 = 21457^2 + 13710^2 .

It is a cyclic number.

It is not a de Polignac number, because 648366949 - 2¹¹ = 648364901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648366949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648360949) 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, 11178712 + ... + 11178769.

It is an arithmetic number, because the mean of its divisors is an integer number (167681115).

Almost surely, 2^648366949 is an apocalyptic number.

It is an amenable number.

648366949 is a deficient number, since it is larger than the sum of its proper divisors (22357511).

648366949 is a wasteful number, since it uses less digits than its factorization.

648366949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22357510.

The product of its digits is 6718464, while the sum is 55.

The square root of 648366949 is about 25463.0506616941. The cubic root of 648366949 is about 865.5130545830.

The spelling of 648366949 in words is "six hundred forty-eight million, three hundred sixty-six thousand, nine hundred forty-nine".