11991552 has 80 divisors (see below), whose sum is σ = 32965152. Its totient is φ = 3870720.

The previous prime is 11991523. The next prime is 11991583. The reversal of 11991552 is 25519911.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 56727 + ... + 56937.

Almost surely, 2^11991552 is an apocalyptic number.

11991552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11991552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16482576).

11991552 is an abundant number, since it is smaller than the sum of its proper divisors (20973600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11991552 is an equidigital number, since it uses as much as digits as its factorization.

11991552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 253 counting only the distinct ones).

The product of its digits is 4050, while the sum is 33.

The square root of 11991552 is about 3462.8820366856. The cubic root of 11991552 is about 228.8891106431.

The spelling of 11991552 in words is "eleven million, nine hundred ninety-one thousand, five hundred fifty-two".