12556501 has 2 divisors, whose sum is σ = 12556502. Its totient is φ = 12556500.

The previous prime is 12556499. The next prime is 12556529. The reversal of 12556501 is 10565521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11737476 + 819025 = 3426^2 + 905^2 .

It is an emirp because it is prime and its reverse (10565521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12556501 - 2¹ = 12556499 is a prime.

Together with 12556499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12556571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278250 + 6278251.

It is an arithmetic number, because the mean of its divisors is an integer number (6278251).

Almost surely, 2^12556501 is an apocalyptic number.

It is an amenable number.

12556501 is a deficient number, since it is larger than the sum of its proper divisors (1).

12556501 is an equidigital number, since it uses as much as digits as its factorization.

12556501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 12556501 is about 3543.5153449647. The cubic root of 12556501 is about 232.4285886980.

The spelling of 12556501 in words is "twelve million, five hundred fifty-six thousand, five hundred one".