805127549521 has 9 divisors (see below), whose sum is σ = 833874864433. Its totient is φ = 777339406480.

The previous prime is 805127549519. The next prime is 805127549533. The reversal of 805127549521 is 125945721508.

The square root of 805127549521 is 897289.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 31431389521 + 773696160000 = 177289^2 + 879600^2 .

It is not a de Polignac number, because 805127549521 - 2¹ = 805127549519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805127549321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26005911 + ... + 26036851.

Almost surely, 2^805127549521 is an apocalyptic number.

805127549521 is the 897289-th square number.

805127549521 is the 448645-th centered octagonal number.

It is an amenable number.

805127549521 is a deficient number, since it is larger than the sum of its proper divisors (28747314912).

805127549521 is an frugal number, since it uses more digits than its factorization.

805127549521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61940 (or 30970 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 49.

Multiplying 805127549521 by its sum of digits (49), we get a square (39451249926529 = 6281023²).

The spelling of 805127549521 in words is "eight hundred five billion, one hundred twenty-seven million, five hundred forty-nine thousand, five hundred twenty-one".