12717731 has 4 divisors (see below), whose sum is σ = 13696032. Its totient is φ = 11739432.

The previous prime is 12717709. The next prime is 12717763. The reversal of 12717731 is 13771721.

12717731 is digitally balanced in base 3, because in such base 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 an emirpimes, since its reverse is a distinct semiprime: 13771721 = 59 ⋅233419.

It is a cyclic number.

It is not a de Polignac number, because 12717731 - 2¹⁰ = 12716707 is a prime.

It is a super-2 number, since 2×12717731² = 323481363576722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12717694 and 12717703.

It is not an unprimeable number, because it can be changed into a prime (12717701) 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, 489131 + ... + 489156.

It is an arithmetic number, because the mean of its divisors is an integer number (3424008).

Almost surely, 2^12717731 is an apocalyptic number.

12717731 is a deficient number, since it is larger than the sum of its proper divisors (978301).

12717731 is an equidigital number, since it uses as much as digits as its factorization.

12717731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978300.

The product of its digits is 2058, while the sum is 29.

The square root of 12717731 is about 3566.1927878341. The cubic root of 12717731 is about 233.4191831488.

The spelling of 12717731 in words is "twelve million, seven hundred seventeen thousand, seven hundred thirty-one".