11601681 has 36 divisors (see below), whose sum is σ = 19526832. Its totient is φ = 6106464.

The previous prime is 11601679. The next prime is 11601721. The reversal of 11601681 is 18610611.

It is not a de Polignac number, because 11601681 - 2¹ = 11601679 is a prime.

It is a super-2 number, since 2×11601681² = 269198004051522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11601631) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24610 + ... + 25076.

It is an arithmetic number, because the mean of its divisors is an integer number (542412).

Almost surely, 2^11601681 is an apocalyptic number.

It is an amenable number.

11601681 is a deficient number, since it is larger than the sum of its proper divisors (7925151).

11601681 is a wasteful number, since it uses less digits than its factorization.

11601681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 11601681 is about 3406.1240435427. The cubic root of 11601681 is about 226.3811733878.

The spelling of 11601681 in words is "eleven million, six hundred one thousand, six hundred eighty-one".