981559803169 has 9 divisors (see below), whose sum is σ = 1078916556081. Its totient is φ = 892317186420.

The previous prime is 981559803139. The next prime is 981559803253. The reversal of 981559803169 is 961308955189.

The square root of 981559803169 is 990737.

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

It is not a de Polignac number, because 981559803169 - 2¹³ = 981559794977 is a prime.

It is a super-2 number, since 2×981559803169² (a number of 25 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 981559803169.

It is not an unprimeable number, because it can be changed into a prime (981559803139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10853074 + ... + 10943140.

Almost surely, 2^981559803169 is an apocalyptic number.

981559803169 is the 990737-th square number.

981559803169 is the 495369-th centered octagonal number.

It is an amenable number.

981559803169 is a deficient number, since it is larger than the sum of its proper divisors (97356752912).

981559803169 is an frugal number, since it uses more digits than its factorization.

981559803169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180156 (or 90078 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 64.

Multiplying 981559803169 by its sum of digits (64), we get a square (62819827402816 = 7925896²).

The spelling of 981559803169 in words is "nine hundred eighty-one billion, five hundred fifty-nine million, eight hundred three thousand, one hundred sixty-nine".