1091707681 has 27 divisors (see below), whose sum is σ = 1209903219. Its totient is φ = 984886128.

The previous prime is 1091707651. The next prime is 1091707723. The reversal of 1091707681 is 1867071901.

The square root of 1091707681 is 33041.

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., 976875025 + 114832656 = 31255^2 + 10716^2 .

It is not a de Polignac number, because 1091707681 - 2¹⁷ = 1091576609 is a prime.

It is a super-2 number, since 2×1091707681² = 2383651321508795522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1091707651) 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, 23227800 + ... + 23227846.

Almost surely, 2^1091707681 is an apocalyptic number.

1091707681 is the 33041-st square number.

1091707681 is the 16521-st centered octagonal number.

It is an amenable number.

1091707681 is a deficient number, since it is larger than the sum of its proper divisors (118195538).

1091707681 is an frugal number, since it uses more digits than its factorization.

1091707681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 40.

The cubic root of 1091707681 is about 1029.6796317241.

The spelling of 1091707681 in words is "one billion, ninety-one million, seven hundred seven thousand, six hundred eighty-one".