12487861 has 2 divisors, whose sum is σ = 12487862. Its totient is φ = 12487860.

The previous prime is 12487841. The next prime is 12487889. The reversal of 12487861 is 16878421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12006225 + 481636 = 3465^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 12487861 - 2⁵ = 12487829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12487861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12487801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6243930 + 6243931.

It is an arithmetic number, because the mean of its divisors is an integer number (6243931).

Almost surely, 2^12487861 is an apocalyptic number.

It is an amenable number.

12487861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12487861 is an equidigital number, since it uses as much as digits as its factorization.

12487861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 12487861 is about 3533.8167751031. The cubic root of 12487861 is about 232.0042916864.

The spelling of 12487861 in words is "twelve million, four hundred eighty-seven thousand, eight hundred sixty-one".