12815791 has 4 divisors (see below), whose sum is σ = 12825000. Its totient is φ = 12806584.

The previous prime is 12815783. The next prime is 12815797. The reversal of 12815791 is 19751821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12815791 - 2³ = 12815783 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 (12815797) 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, 2041 + ... + 5458.

It is an arithmetic number, because the mean of its divisors is an integer number (3206250).

Almost surely, 2^12815791 is an apocalyptic number.

12815791 is a deficient number, since it is larger than the sum of its proper divisors (9209).

12815791 is an equidigital number, since it uses as much as digits as its factorization.

12815791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9208.

The product of its digits is 5040, while the sum is 34.

The square root of 12815791 is about 3579.9149431236. The cubic root of 12815791 is about 234.0175736187.

The spelling of 12815791 in words is "twelve million, eight hundred fifteen thousand, seven hundred ninety-one".