12717813 has 4 divisors (see below), whose sum is σ = 16957088. Its totient is φ = 8478540.

The previous prime is 12717799. The next prime is 12717823. The reversal of 12717813 is 31871721.

12717813 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 12717813 - 2⁴ = 12717797 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 (12717823) 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, 2119633 + ... + 2119638.

It is an arithmetic number, because the mean of its divisors is an integer number (4239272).

Almost surely, 2^12717813 is an apocalyptic number.

It is an amenable number.

12717813 is a deficient number, since it is larger than the sum of its proper divisors (4239275).

12717813 is an equidigital number, since it uses as much as digits as its factorization.

12717813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4239274.

The product of its digits is 2352, while the sum is 30.

The square root of 12717813 is about 3566.2042846702. The cubic root of 12717813 is about 233.4196848193.

It can be divided in two parts, 12717 and 813, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 12717813 in words is "twelve million, seven hundred seventeen thousand, eight hundred thirteen".