11631681 has 24 divisors (see below), whose sum is σ = 17594304. Its totient is φ = 7678800.

The previous prime is 11631647. The next prime is 11631713. The reversal of 11631681 is 18613611.

It is a de Polignac number, because none of the positive numbers 2^k-11631681 is a prime.

It is a super-2 number, since 2×11631681² = 270592005771522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11631611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36535 + ... + 36851.

It is an arithmetic number, because the mean of its divisors is an integer number (733096).

Almost surely, 2^11631681 is an apocalyptic number.

It is an amenable number.

11631681 is a deficient number, since it is larger than the sum of its proper divisors (5962623).

11631681 is an equidigital number, since it uses as much as digits as its factorization.

11631681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 471 counting only the distinct ones).

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

The square root of 11631681 is about 3410.5250328945. The cubic root of 11631681 is about 226.5761333469.

The spelling of 11631681 in words is "eleven million, six hundred thirty-one thousand, six hundred eighty-one".