11613681 has 12 divisors (see below), whose sum is σ = 16877952. Its totient is φ = 7695096.

The previous prime is 11613677. The next prime is 11613691. The reversal of 11613681 is 18631611.

It is not a de Polignac number, because 11613681 - 2² = 11613677 is a prime.

It is a super-2 number, since 2×11613681² = 269755172739522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11613631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2361 + ... + 5366.

It is an arithmetic number, because the mean of its divisors is an integer number (1406496).

Almost surely, 2^11613681 is an apocalyptic number.

It is an amenable number.

11613681 is a deficient number, since it is larger than the sum of its proper divisors (5264271).

11613681 is a wasteful number, since it uses less digits than its factorization.

11613681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900 (or 7897 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 11613681 is about 3407.8851213032. The cubic root of 11613681 is about 226.4591976558.

The spelling of 11613681 in words is "eleven million, six hundred thirteen thousand, six hundred eighty-one".