12197131591 has 4 divisors (see below), whose sum is σ = 12199948272. Its totient is φ = 12194314912.

The previous prime is 12197131577. The next prime is 12197131603. The reversal of 12197131591 is 19513179121.

12197131591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12197131591 - 2¹¹ = 12197129543 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12197131561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401835 + ... + 1410508.

It is an arithmetic number, because the mean of its divisors is an integer number (3049987068).

Almost surely, 2^12197131591 is an apocalyptic number.

12197131591 is a deficient number, since it is larger than the sum of its proper divisors (2816681).

12197131591 is an equidigital number, since it uses as much as digits as its factorization.

12197131591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816680.

The product of its digits is 17010, while the sum is 40.

The spelling of 12197131591 in words is "twelve billion, one hundred ninety-seven million, one hundred thirty-one thousand, five hundred ninety-one".