12491848909 has 4 divisors (see below), whose sum is σ = 12493023516. Its totient is φ = 12490674304.

The previous prime is 12491848907. The next prime is 12491848913. The reversal of 12491848909 is 90984819421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90984819421 = 1619 ⋅56198159.

It can be written as a sum of positive squares in 2 ways, for example, as 6742873225 + 5748975684 = 82115^2 + 75822^2 .

It is a cyclic number.

It is not a de Polignac number, because 12491848909 - 2¹ = 12491848907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12491848909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491848907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571204 + ... + 592669.

It is an arithmetic number, because the mean of its divisors is an integer number (3123255879).

Almost surely, 2^12491848909 is an apocalyptic number.

It is an amenable number.

12491848909 is a deficient number, since it is larger than the sum of its proper divisors (1174607).

12491848909 is a wasteful number, since it uses less digits than its factorization.

12491848909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174606.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 12491848909 in words is "twelve billion, four hundred ninety-one million, eight hundred forty-eight thousand, nine hundred nine".