12131105265 has 32 divisors (see below), whose sum is σ = 21630485760. Its totient is φ = 6450700032.

The previous prime is 12131105251. The next prime is 12131105269. The reversal of 12131105265 is 56250113121.

12131105265 is a `hidden beast` number, since 1 + 2 + 131 + 1 + 0 + 526 + 5 = 666.

It is not a de Polignac number, because 12131105265 - 2⁶ = 12131105201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12131105269) 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 31 ways as a sum of consecutive naturals, for example, 87829 + ... + 178818.

It is an arithmetic number, because the mean of its divisors is an integer number (675952680).

Almost surely, 2^12131105265 is an apocalyptic number.

12131105265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12131105265 is a deficient number, since it is larger than the sum of its proper divisors (9499380495).

12131105265 is a wasteful number, since it uses less digits than its factorization.

12131105265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266998 (or 266992 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 12131105265 its reverse (56250113121), we get a palindrome (68381218386).

The spelling of 12131105265 in words is "twelve billion, one hundred thirty-one million, one hundred five thousand, two hundred sixty-five".