12815287 has 4 divisors (see below), whose sum is σ = 12995856. Its totient is φ = 12634720.

The previous prime is 12815281. The next prime is 12815293. The reversal of 12815287 is 78251821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78251821 = 41 ⋅1908581.

It is an interprime number because it is at equal distance from previous prime (12815281) and next prime (12815293).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12815287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90178 + ... + 90319.

It is an arithmetic number, because the mean of its divisors is an integer number (3248964).

Almost surely, 2^12815287 is an apocalyptic number.

12815287 is a deficient number, since it is larger than the sum of its proper divisors (180569).

12815287 is an equidigital number, since it uses as much as digits as its factorization.

12815287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180568.

The product of its digits is 8960, while the sum is 34.

The square root of 12815287 is about 3579.8445496977. The cubic root of 12815287 is about 234.0145058823.

The spelling of 12815287 in words is "twelve million, eight hundred fifteen thousand, two hundred eighty-seven".