12912731 has 4 divisors (see below), whose sum is σ = 13906032. Its totient is φ = 11919432.

The previous prime is 12912719. The next prime is 12912769. The reversal of 12912731 is 13721921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13721921 = 41 ⋅334681.

It is a cyclic number.

It is not a de Polignac number, because 12912731 - 2¹⁴ = 12896347 is a prime.

It is a super-2 number, since 2×12912731² = 333477243756722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12912731.

It is not an unprimeable number, because it can be changed into a prime (12912701) 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, 496631 + ... + 496656.

It is an arithmetic number, because the mean of its divisors is an integer number (3476508).

Almost surely, 2^12912731 is an apocalyptic number.

12912731 is a deficient number, since it is larger than the sum of its proper divisors (993301).

12912731 is an equidigital number, since it uses as much as digits as its factorization.

12912731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993300.

The product of its digits is 756, while the sum is 26.

The square root of 12912731 is about 3593.4288639126. The cubic root of 12912731 is about 234.6061366871.

The spelling of 12912731 in words is "twelve million, nine hundred twelve thousand, seven hundred thirty-one".