12041991 has 24 divisors (see below), whose sum is σ = 19721520. Its totient is φ = 7019136.

The previous prime is 12041957. The next prime is 12041999. The reversal of 12041991 is 19914021.

It is not a de Polignac number, because 12041991 - 2⁹ = 12041479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12041999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 486 + ... + 4931.

It is an arithmetic number, because the mean of its divisors is an integer number (821730).

Almost surely, 2^12041991 is an apocalyptic number.

12041991 is a deficient number, since it is larger than the sum of its proper divisors (7679529).

12041991 is a wasteful number, since it uses less digits than its factorization.

12041991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455 (or 5452 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 12041991 is about 3470.1572010501. The cubic root of 12041991 is about 229.2095803859.

The spelling of 12041991 in words is "twelve million, forty-one thousand, nine hundred ninety-one".