12820001191 has 4 divisors (see below), whose sum is σ = 12821489712. Its totient is φ = 12818512672.

The previous prime is 12820001179. The next prime is 12820001197. The reversal of 12820001191 is 19110002821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12820001191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820001197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731266 + ... + 748591.

It is an arithmetic number, because the mean of its divisors is an integer number (3205372428).

Almost surely, 2^12820001191 is an apocalyptic number.

12820001191 is a deficient number, since it is larger than the sum of its proper divisors (1488521).

12820001191 is an equidigital number, since it uses as much as digits as its factorization.

12820001191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488520.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 12820001191 in words is "twelve billion, eight hundred twenty million, one thousand, one hundred ninety-one".