12191949 has 48 divisors (see below), whose sum is σ = 22349184. Its totient is φ = 6220800.

The previous prime is 12191947. The next prime is 12192017. The reversal of 12191949 is 94919121.

It is not a de Polignac number, because 12191949 - 2¹ = 12191947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12191947) 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 47 ways as a sum of consecutive naturals, for example, 50469 + ... + 50709.

It is an arithmetic number, because the mean of its divisors is an integer number (465608).

Almost surely, 2^12191949 is an apocalyptic number.

It is an amenable number.

12191949 is a deficient number, since it is larger than the sum of its proper divisors (10157235).

12191949 is a wasteful number, since it uses less digits than its factorization.

12191949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 335 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 12191949 is about 3491.6971518160. The cubic root of 12191949 is about 230.1571012374.

The spelling of 12191949 in words is "twelve million, one hundred ninety-one thousand, nine hundred forty-nine".