11988081 has 20 divisors (see below), whose sum is σ = 20467392. Its totient is φ = 6850008.

The previous prime is 11988061. The next prime is 11988091. The reversal of 11988081 is 18088911.

It is not a de Polignac number, because 11988081 - 2⁷ = 11987953 is a prime.

It is a super-2 number, since 2×11988081² = 287428172125122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11988061) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10005 + ... + 11138.

Almost surely, 2^11988081 is an apocalyptic number.

It is an amenable number.

11988081 is a deficient number, since it is larger than the sum of its proper divisors (8479311).

11988081 is an equidigital number, since it uses as much as digits as its factorization.

11988081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21162 (or 21153 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 11988081 is about 3462.3808282741. The cubic root of 11988081 is about 228.8670242395.

The spelling of 11988081 in words is "eleven million, nine hundred eighty-eight thousand, eighty-one".