5638270721 has 2 divisors, whose sum is σ = 5638270722. Its totient is φ = 5638270720.

The previous prime is 5638270709. The next prime is 5638270723. The reversal of 5638270721 is 1270728365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3882660721 + 1755610000 = 62311^2 + 41900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5638270721 is a prime.

Together with 5638270723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5638270723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2819135360 + 2819135361.

It is an arithmetic number, because the mean of its divisors is an integer number (2819135361).

Almost surely, 2^5638270721 is an apocalyptic number.

It is an amenable number.

5638270721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5638270721 is an equidigital number, since it uses as much as digits as its factorization.

5638270721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 5638270721 is about 75088.4193534529. The cubic root of 5638270721 is about 1779.8441475503.

The spelling of 5638270721 in words is "five billion, six hundred thirty-eight million, two hundred seventy thousand, seven hundred twenty-one".