12287861 has 2 divisors, whose sum is σ = 12287862. Its totient is φ = 12287860.

The previous prime is 12287837. The next prime is 12287879. The reversal of 12287861 is 16878221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9647236 + 2640625 = 3106^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 12287861 - 2¹⁴ = 12271477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12287801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6143930 + 6143931.

It is an arithmetic number, because the mean of its divisors is an integer number (6143931).

Almost surely, 2^12287861 is an apocalyptic number.

It is an amenable number.

12287861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12287861 is an equidigital number, since it uses as much as digits as its factorization.

12287861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 35.

The square root of 12287861 is about 3505.4045415615. The cubic root of 12287861 is about 230.7590611387.

The spelling of 12287861 in words is "twelve million, two hundred eighty-seven thousand, eight hundred sixty-one".