12191550 has 96 divisors (see below), whose sum is σ = 36640512. Its totient is φ = 2618880.

The previous prime is 12191507. The next prime is 12191563. The reversal of 12191550 is 5519121.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12191550.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 17509 + ... + 18191.

It is an arithmetic number, because the mean of its divisors is an integer number (381672).

Almost surely, 2^12191550 is an apocalyptic number.

12191550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12191550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18320256).

12191550 is an abundant number, since it is smaller than the sum of its proper divisors (24448962).

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

12191550 is a wasteful number, since it uses less digits than its factorization.

12191550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 12191550 is about 3491.6400158092. The cubic root of 12191550 is about 230.1545904634.

The spelling of 12191550 in words is "twelve million, one hundred ninety-one thousand, five hundred fifty".