12531643 has 2 divisors, whose sum is σ = 12531644. Its totient is φ = 12531642.

The previous prime is 12531637. The next prime is 12531647. The reversal of 12531643 is 34613521.

It is a strong prime.

It is an emirp because it is prime and its reverse (34613521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12531643 - 2⁹ = 12531131 is a prime.

It is not a weakly prime, because it can be changed into another prime (12531647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6265821 + 6265822.

It is an arithmetic number, because the mean of its divisors is an integer number (6265822).

Almost surely, 2^12531643 is an apocalyptic number.

12531643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12531643 is an equidigital number, since it uses as much as digits as its factorization.

12531643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 12531643 is about 3540.0060734411. The cubic root of 12531643 is about 232.2751083945.

The spelling of 12531643 in words is "twelve million, five hundred thirty-one thousand, six hundred forty-three".