12687591 has 8 divisors (see below), whose sum is σ = 19333504. Its totient is φ = 7250040.

The previous prime is 12687583. The next prime is 12687599. The reversal of 12687591 is 19578621.

12687591 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12687583) and next prime (12687599).

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

It is not a de Polignac number, because 12687591 - 2³ = 12687583 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12687599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302065 + ... + 302106.

It is an arithmetic number, because the mean of its divisors is an integer number (2416688).

Almost surely, 2^12687591 is an apocalyptic number.

12687591 is a deficient number, since it is larger than the sum of its proper divisors (6645913).

12687591 is an equidigital number, since it uses as much as digits as its factorization.

12687591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604181.

The product of its digits is 30240, while the sum is 39.

The square root of 12687591 is about 3561.9644860666. The cubic root of 12687591 is about 233.2346423904.

The spelling of 12687591 in words is "twelve million, six hundred eighty-seven thousand, five hundred ninety-one".