12991041 has 24 divisors (see below), whose sum is σ = 22576320. Its totient is φ = 7032096.

The previous prime is 12991037. The next prime is 12991049. The reversal of 12991041 is 14019921.

It is not a de Polignac number, because 12991041 - 2² = 12991037 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12990996 and 12991014.

It is not an unprimeable number, because it can be changed into a prime (12991049) 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, 4230 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (940680).

Almost surely, 2^12991041 is an apocalyptic number.

It is an amenable number.

12991041 is a deficient number, since it is larger than the sum of its proper divisors (9585279).

12991041 is a wasteful number, since it uses less digits than its factorization.

12991041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10885 (or 10882 counting only the distinct ones).

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

The square root of 12991041 is about 3604.3086715763. The cubic root of 12991041 is about 235.0794419811.

The spelling of 12991041 in words is "twelve million, nine hundred ninety-one thousand, forty-one".