12687481 has 4 divisors (see below), whose sum is σ = 12784464. Its totient is φ = 12590500.

The previous prime is 12687469. The next prime is 12687523. The reversal of 12687481 is 18478621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12687481 - 2⁵ = 12687449 is a prime.

It is a super-2 number, since 2×12687481² = 321944348250722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12687481.

It is not an unprimeable number, because it can be changed into a prime (12684481) 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 3 ways as a sum of consecutive naturals, for example, 48295 + ... + 48556.

It is an arithmetic number, because the mean of its divisors is an integer number (3196116).

Almost surely, 2^12687481 is an apocalyptic number.

It is an amenable number.

12687481 is a deficient number, since it is larger than the sum of its proper divisors (96983).

12687481 is an equidigital number, since it uses as much as digits as its factorization.

12687481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96982.

The product of its digits is 21504, while the sum is 37.

The square root of 12687481 is about 3561.9490451156. The cubic root of 12687481 is about 233.2339683490.

The spelling of 12687481 in words is "twelve million, six hundred eighty-seven thousand, four hundred eighty-one".