12500861 has 4 divisors (see below), whose sum is σ = 12712800. Its totient is φ = 12288924.

The previous prime is 12500849. The next prime is 12500867. The reversal of 12500861 is 16800521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16800521 = 389 ⋅43189.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12500861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12500867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105881 + ... + 105998.

It is an arithmetic number, because the mean of its divisors is an integer number (3178200).

Almost surely, 2^12500861 is an apocalyptic number.

It is an amenable number.

12500861 is a deficient number, since it is larger than the sum of its proper divisors (211939).

12500861 is an equidigital number, since it uses as much as digits as its factorization.

12500861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211938.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 12500861 is about 3535.6556676238. The cubic root of 12500861 is about 232.0847701023.

The spelling of 12500861 in words is "twelve million, five hundred thousand, eight hundred sixty-one".