12915681 has 8 divisors (see below), whose sum is σ = 17463744. Its totient is φ = 8489040.

The previous prime is 12915659. The next prime is 12915689. The reversal of 12915681 is 18651921.

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

It is not a de Polignac number, because 12915681 - 2⁹ = 12915169 is a prime.

It is a super-2 number, since 2×12915681² = 333629631387522, which contains 22 as substring.

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 not an unprimeable number, because it can be changed into a prime (12915689) 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 7 ways as a sum of consecutive naturals, for example, 30106 + ... + 30531.

It is an arithmetic number, because the mean of its divisors is an integer number (2182968).

Almost surely, 2^12915681 is an apocalyptic number.

It is an amenable number.

12915681 is a deficient number, since it is larger than the sum of its proper divisors (4548063).

12915681 is an equidigital number, since it uses as much as digits as its factorization.

12915681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60711.

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

The square root of 12915681 is about 3593.8393119337. The cubic root of 12915681 is about 234.6240011086.

The spelling of 12915681 in words is "twelve million, nine hundred fifteen thousand, six hundred eighty-one".