1059271165681 has 3 divisors (see below), whose sum is σ = 1059272194891. Its totient is φ = 1059270136472.

The previous prime is 1059271165669. The next prime is 1059271165717. The reversal of 1059271165681 is 1865611729501.

The square root of 1059271165681 is 1029209.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 67812847281 + 991458318400 = 260409^2 + 995720^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1059271165681 is a prime.

It is a super-2 number, since 2×1059271165681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1059271165661) 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 2 ways as a sum of consecutive naturals, for example, 514605 + ... + 1543813.

Almost surely, 2^{1059271165681} is an apocalyptic number.

1059271165681 is the 1029209-th square number.

1059271165681 is the 514605-th centered octagonal number.

It is an amenable number.

1059271165681 is a deficient number, since it is larger than the sum of its proper divisors (1029210).

1059271165681 is an frugal number, since it uses more digits than its factorization.

1059271165681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058418 (or 1029209 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 52.

The spelling of 1059271165681 in words is "one trillion, fifty-nine billion, two hundred seventy-one million, one hundred sixty-five thousand, six hundred eighty-one".