12911223797541 has 80 divisors (see below), whose sum is σ = 19850496906240. Its totient is φ = 8358103307520.

The previous prime is 12911223797531. The next prime is 12911223797543. The reversal of 12911223797541 is 14579732211921.

It is a happy number.

12911223797541 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 1 + 2 + 2 + 3 + 7 + 97 + 541 = 666.

It is not a de Polignac number, because 12911223797541 - 2⁹ = 12911223797029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12911223797543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 985357396 + ... + 985370498.

It is an arithmetic number, because the mean of its divisors is an integer number (248131211328).

Almost surely, 2^{12911223797541} is an apocalyptic number.

It is an amenable number.

12911223797541 is a deficient number, since it is larger than the sum of its proper divisors (6939273108699).

12911223797541 is a wasteful number, since it uses less digits than its factorization.

12911223797541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14528 (or 14519 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 12911223797541 in words is "twelve trillion, nine hundred eleven billion, two hundred twenty-three million, seven hundred ninety-seven thousand, five hundred forty-one".