12001011131 has 4 divisors (see below), whose sum is σ = 12001977912. Its totient is φ = 12000044352.

The previous prime is 12001011119. The next prime is 12001011163. The reversal of 12001011131 is 13111010021.

It is a happy number.

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-12001011131 is a prime.

It is a super-2 number, since 2×12001011131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12001017131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464525 + ... + 489678.

It is an arithmetic number, because the mean of its divisors is an integer number (3000494478).

Almost surely, 2^12001011131 is an apocalyptic number.

12001011131 is a deficient number, since it is larger than the sum of its proper divisors (966781).

12001011131 is an equidigital number, since it uses as much as digits as its factorization.

12001011131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966780.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 12001011131 its reverse (13111010021), we get a palindrome (25112021152).

The spelling of 12001011131 in words is "twelve billion, one million, eleven thousand, one hundred thirty-one".