12647531 has 4 divisors (see below), whose sum is σ = 13620432. Its totient is φ = 11674632.

The previous prime is 12647527. The next prime is 12647561. The reversal of 12647531 is 13574621.

12647531 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.

It is a cyclic number.

It is not a de Polignac number, because 12647531 - 2² = 12647527 is a prime.

It is a super-2 number, since 2×12647531² = 319920080791922, 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 = 12647494 and 12647503.

It is not an unprimeable number, because it can be changed into a prime (12647561) 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, 486431 + ... + 486456.

It is an arithmetic number, because the mean of its divisors is an integer number (3405108).

Almost surely, 2^12647531 is an apocalyptic number.

12647531 is a deficient number, since it is larger than the sum of its proper divisors (972901).

12647531 is an equidigital number, since it uses as much as digits as its factorization.

12647531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972900.

The product of its digits is 5040, while the sum is 29.

The square root of 12647531 is about 3556.3367388367. The cubic root of 12647531 is about 232.9889106697.

The spelling of 12647531 in words is "twelve million, six hundred forty-seven thousand, five hundred thirty-one".