12547531 has 2 divisors, whose sum is σ = 12547532. Its totient is φ = 12547530.

The previous prime is 12547523. The next prime is 12547603. The reversal of 12547531 is 13574521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12547531 - 2³ = 12547523 is a prime.

It is a super-2 number, since 2×12547531² = 314881068391922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12547531.

It is not a weakly prime, because it can be changed into another prime (12547501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6273765 + 6273766.

It is an arithmetic number, because the mean of its divisors is an integer number (6273766).

Almost surely, 2^12547531 is an apocalyptic number.

12547531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12547531 is an equidigital number, since it uses as much as digits as its factorization.

12547531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 12547531 is about 3542.2494265650. The cubic root of 12547531 is about 232.3732287667.

The spelling of 12547531 in words is "twelve million, five hundred forty-seven thousand, five hundred thirty-one".