12981913 has 12 divisors (see below), whose sum is σ = 15759360. Its totient is φ = 10642632.

The previous prime is 12981911. The next prime is 12981949. The reversal of 12981913 is 31918921.

It is not a de Polignac number, because 12981913 - 2¹ = 12981911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12981911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4633 + ... + 6886.

It is an arithmetic number, because the mean of its divisors is an integer number (1313280).

Almost surely, 2^12981913 is an apocalyptic number.

It is an amenable number.

12981913 is a deficient number, since it is larger than the sum of its proper divisors (2777447).

12981913 is a wasteful number, since it uses less digits than its factorization.

12981913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11556 (or 11549 counting only the distinct ones).

The product of its digits is 3888, while the sum is 34.

The square root of 12981913 is about 3603.0421868194. The cubic root of 12981913 is about 235.0243704921.

The spelling of 12981913 in words is "twelve million, nine hundred eighty-one thousand, nine hundred thirteen".