5447128861 has 2 divisors, whose sum is σ = 5447128862. Its totient is φ = 5447128860.

The previous prime is 5447128859. The next prime is 5447128889. The reversal of 5447128861 is 1688217445.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5373769636 + 73359225 = 73306^2 + 8565^2 .

It is a cyclic number.

It is not a de Polignac number, because 5447128861 - 2¹ = 5447128859 is a prime.

Together with 5447128859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5447128811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2723564430 + 2723564431.

It is an arithmetic number, because the mean of its divisors is an integer number (2723564431).

Almost surely, 2^5447128861 is an apocalyptic number.

It is an amenable number.

5447128861 is a deficient number, since it is larger than the sum of its proper divisors (1).

5447128861 is an equidigital number, since it uses as much as digits as its factorization.

5447128861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 46.

The square root of 5447128861 is about 73804.6669323831. Note that the first 3 decimals coincide. The cubic root of 5447128861 is about 1759.4997783181.

The spelling of 5447128861 in words is "five billion, four hundred forty-seven million, one hundred twenty-eight thousand, eight hundred sixty-one".