12781989349 has 8 divisors (see below), whose sum is σ = 13174513920. Its totient is φ = 12395367600.

The previous prime is 12781989281. The next prime is 12781989371. The reversal of 12781989349 is 94398918721.

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 12781989349 - 2¹⁹ = 12781465061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781989379) 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 7 ways as a sum of consecutive naturals, for example, 1471309 + ... + 1479970.

It is an arithmetic number, because the mean of its divisors is an integer number (1646814240).

Almost surely, 2^12781989349 is an apocalyptic number.

It is an amenable number.

12781989349 is a deficient number, since it is larger than the sum of its proper divisors (392524571).

12781989349 is an equidigital number, since it uses as much as digits as its factorization.

12781989349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951411.

The product of its digits is 7838208, while the sum is 61.

The spelling of 12781989349 in words is "twelve billion, seven hundred eighty-one million, nine hundred eighty-nine thousand, three hundred forty-nine".