12981615 has 16 divisors (see below), whose sum is σ = 21022848. Its totient is φ = 6839456.

The previous prime is 12981613. The next prime is 12981623. The reversal of 12981615 is 51618921.

It is a cyclic number.

It is not a de Polignac number, because 12981615 - 2¹ = 12981613 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12981611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3969 + ... + 6458.

It is an arithmetic number, because the mean of its divisors is an integer number (1313928).

Almost surely, 2^12981615 is an apocalyptic number.

12981615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12981615 is a deficient number, since it is larger than the sum of its proper divisors (8041233).

12981615 is a wasteful number, since it uses less digits than its factorization.

12981615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10518.

The product of its digits is 4320, while the sum is 33.

The square root of 12981615 is about 3603.0008326394. Note that the first 3 decimals coincide. The cubic root of 12981615 is about 235.0225721490.

The spelling of 12981615 in words is "twelve million, nine hundred eighty-one thousand, six hundred fifteen".