12743531 has 4 divisors (see below), whose sum is σ = 12750672. Its totient is φ = 12736392.

The previous prime is 12743527. The next prime is 12743539. The reversal of 12743531 is 13534721.

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 12743531 - 2² = 12743527 is a prime.

It is a super-2 number, since 2×12743531² = 324795164695922, 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 12743531.

It is not an unprimeable number, because it can be changed into a prime (12743539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1730 + ... + 5336.

It is an arithmetic number, because the mean of its divisors is an integer number (3187668).

Almost surely, 2^12743531 is an apocalyptic number.

12743531 is a deficient number, since it is larger than the sum of its proper divisors (7141).

12743531 is an equidigital number, since it uses as much as digits as its factorization.

12743531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7140.

The product of its digits is 2520, while the sum is 26.

The square root of 12743531 is about 3569.8082581562. The cubic root of 12743531 is about 233.5769195448.

The spelling of 12743531 in words is "twelve million, seven hundred forty-three thousand, five hundred thirty-one".