12391855249 has 8 divisors (see below), whose sum is σ = 12463295688. Its totient is φ = 12320609280.

The previous prime is 12391855247. The next prime is 12391855253. The reversal of 12391855249 is 94255819321.

It can be written as a sum of positive squares in 4 ways, for example, as 1851753024 + 10540102225 = 43032^2 + 102665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12391855249 - 2¹ = 12391855247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12391855247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80169 + ... + 176665.

It is an arithmetic number, because the mean of its divisors is an integer number (1557911961).

Almost surely, 2^12391855249 is an apocalyptic number.

It is an amenable number.

12391855249 is a deficient number, since it is larger than the sum of its proper divisors (71440439).

12391855249 is an equidigital number, since it uses as much as digits as its factorization.

12391855249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97235.

The product of its digits is 777600, while the sum is 49.

The spelling of 12391855249 in words is "twelve billion, three hundred ninety-one million, eight hundred fifty-five thousand, two hundred forty-nine".