5648381821 has 2 divisors, whose sum is σ = 5648381822. Its totient is φ = 5648381820.

The previous prime is 5648381813. The next prime is 5648381863. The reversal of 5648381821 is 1281838465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5596685721 + 51696100 = 74811^2 + 7190^2 .

It is a cyclic number.

It is not a de Polignac number, because 5648381821 - 2³ = 5648381813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5648381521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2824190910 + 2824190911.

It is an arithmetic number, because the mean of its divisors is an integer number (2824190911).

Almost surely, 2^5648381821 is an apocalyptic number.

It is an amenable number.

5648381821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5648381821 is an equidigital number, since it uses as much as digits as its factorization.

5648381821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 368640, while the sum is 46.

The square root of 5648381821 is about 75155.7171544521. The cubic root of 5648381821 is about 1780.9074425598.

The spelling of 5648381821 in words is "five billion, six hundred forty-eight million, three hundred eighty-one thousand, eight hundred twenty-one".