5471561721 has 16 divisors (see below), whose sum is σ = 7551774720. Its totient is φ = 3520185360.

The previous prime is 5471561687. The next prime is 5471561743. The reversal of 5471561721 is 1271651745.

It is not a de Polignac number, because 5471561721 - 2¹⁰ = 5471560697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5471561721.

It is not an unprimeable number, because it can be changed into a prime (5471561761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48555 + ... + 115328.

It is an arithmetic number, because the mean of its divisors is an integer number (471985920).

Almost surely, 2^5471561721 is an apocalyptic number.

It is an amenable number.

5471561721 is a deficient number, since it is larger than the sum of its proper divisors (2080212999).

5471561721 is a wasteful number, since it uses less digits than its factorization.

5471561721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164276.

The product of its digits is 58800, while the sum is 39.

The square root of 5471561721 is about 73970.0055495469. The cubic root of 5471561721 is about 1762.1265747173.

The spelling of 5471561721 in words is "five billion, four hundred seventy-one million, five hundred sixty-one thousand, seven hundred twenty-one".