12918441591 has 48 divisors (see below), whose sum is σ = 20718391200. Its totient is φ = 7690464000.

The previous prime is 12918441577. The next prime is 12918441619. The reversal of 12918441591 is 19514481921.

It is a happy number.

12918441591 is a `hidden beast` number, since 1 + 2 + 9 + 18 + 4 + 41 + 591 = 666.

It is not a de Polignac number, because 12918441591 - 2⁷ = 12918441463 is a prime.

It is a super-2 number, since 2×12918441591² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12918441091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8339085 + ... + 8340633.

It is an arithmetic number, because the mean of its divisors is an integer number (431633150).

Almost surely, 2^12918441591 is an apocalyptic number.

12918441591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12918441591 is a deficient number, since it is larger than the sum of its proper divisors (7799949609).

12918441591 is a wasteful number, since it uses less digits than its factorization.

12918441591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008 (or 3005 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The spelling of 12918441591 in words is "twelve billion, nine hundred eighteen million, four hundred forty-one thousand, five hundred ninety-one".