11530681 has 4 divisors (see below), whose sum is σ = 11649652. Its totient is φ = 11411712.

The previous prime is 11530669. The next prime is 11530703. The reversal of 11530681 is 18603511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18603511 = 2803 ⋅6637.

It can be written as a sum of positive squares in 2 ways, for example, as 6843456 + 4687225 = 2616^2 + 2165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11530681 is a prime.

It is a super-2 number, since 2×11530681² = 265913208647522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11530621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59340 + ... + 59533.

It is an arithmetic number, because the mean of its divisors is an integer number (2912413).

Almost surely, 2^11530681 is an apocalyptic number.

11530681 is the 1961-st hex number.

It is an amenable number.

11530681 is a deficient number, since it is larger than the sum of its proper divisors (118971).

11530681 is an equidigital number, since it uses as much as digits as its factorization.

11530681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118970.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 11530681 is about 3395.6856450502. The cubic root of 11530681 is about 225.9184254108.

The spelling of 11530681 in words is "eleven million, five hundred thirty thousand, six hundred eighty-one".