8201447809489 has 27 divisors (see below), whose sum is σ = 9084986394939. Its totient is φ = 7398270285120.

The previous prime is 8201447809481. The next prime is 8201447809517. The reversal of 8201447809489 is 9849087441028.

The square root of 8201447809489 is 2863817.

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

It can be written as a sum of positive squares in only one way, i.e., 217477659025 + 7983970150464 = 466345^2 + 2825592^2 .

It is not a de Polignac number, because 8201447809489 - 2³ = 8201447809481 is a prime.

It is a super-2 number, since 2×8201447809489² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8201447809489.

It is not an unprimeable number, because it can be changed into a prime (8201447809481) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4378775257 + ... + 4378777129.

Almost surely, 2^{8201447809489} is an apocalyptic number.

8201447809489 is the 2863817-th square number.

8201447809489 is the 1431909-th centered octagonal number.

It is an amenable number.

8201447809489 is a deficient number, since it is larger than the sum of its proper divisors (883538585450).

8201447809489 is an frugal number, since it uses more digits than its factorization.

8201447809489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046 (or 2023 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 64.

Multiplying 8201447809489 by its sum of digits (64), we get a square (524892659807296 = 22910536²).

The spelling of 8201447809489 in words is "eight trillion, two hundred one billion, four hundred forty-seven million, eight hundred nine thousand, four hundred eighty-nine".