12491219437 has 4 divisors (see below), whose sum is σ = 12677655616. Its totient is φ = 12304783260.

The previous prime is 12491219423. The next prime is 12491219467. The reversal of 12491219437 is 73491219421.

It is a happy number.

12491219437 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73491219421 = 2333 ⋅31500737.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12491219437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12491219393 and 12491219402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491219467) 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, 93217989 + ... + 93218122.

It is an arithmetic number, because the mean of its divisors is an integer number (3169413904).

Almost surely, 2^12491219437 is an apocalyptic number.

It is an amenable number.

12491219437 is a deficient number, since it is larger than the sum of its proper divisors (186436179).

12491219437 is an equidigital number, since it uses as much as digits as its factorization.

12491219437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186436178.

The product of its digits is 108864, while the sum is 43.

The spelling of 12491219437 in words is "twelve billion, four hundred ninety-one million, two hundred nineteen thousand, four hundred thirty-seven".