648447893 has 2 divisors, whose sum is σ = 648447894. Its totient is φ = 648447892.

The previous prime is 648447889. The next prime is 648447929. The reversal of 648447893 is 398744846.

648447893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608214244 + 40233649 = 24662^2 + 6343^2 .

It is a cyclic number.

It is not a de Polignac number, because 648447893 - 2² = 648447889 is a prime.

It is a super-2 number, since 2×648447893² = 840969339872278898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648447193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324223946 + 324223947.

It is an arithmetic number, because the mean of its divisors is an integer number (324223947).

Almost surely, 2^648447893 is an apocalyptic number.

It is an amenable number.

648447893 is a deficient number, since it is larger than the sum of its proper divisors (1).

648447893 is an equidigital number, since it uses as much as digits as its factorization.

648447893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 53.

The square root of 648447893 is about 25464.6400524335. The cubic root of 648447893 is about 865.5490707996.

The spelling of 648447893 in words is "six hundred forty-eight million, four hundred forty-seven thousand, eight hundred ninety-three".