1091747047689 has 81 divisors (see below), whose sum is σ = 1742028897063. Its totient is φ = 658717592544.

The previous prime is 1091747047661. The next prime is 1091747047739. The reversal of 1091747047689 is 9867407471901.

The square root of 1091747047689 is 1044867.

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

1091747047689 is a `hidden beast` number, since 1 + 0 + 9 + 17 + 4 + 70 + 476 + 89 = 666.

1091747047689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 529409036025 + 562338011664 = 727605^2 + 749892^2 .

It is not a de Polignac number, because 1091747047689 - 2¹³ = 1091747039497 is a prime.

It is a super-2 number, since 2×1091747047689² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1091747047649) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1369820239 + ... + 1369821035.

Almost surely, 2^{1091747047689} is an apocalyptic number.

1091747047689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1091747047689 is the 1044867-th square number.

1091747047689 is the 522434-th centered octagonal number.

It is an amenable number.

1091747047689 is a deficient number, since it is larger than the sum of its proper divisors (650281849374).

1091747047689 is an frugal number, since it uses more digits than its factorization.

1091747047689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The spelling of 1091747047689 in words is "one trillion, ninety-one billion, seven hundred forty-seven million, forty-seven thousand, six hundred eighty-nine".