12000011861 has 2 divisors, whose sum is σ = 12000011862. Its totient is φ = 12000011860.

The previous prime is 12000011851. The next prime is 12000012023. The reversal of 12000011861 is 16811000021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8893621636 + 3106390225 = 94306^2 + 55735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12000011861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12000011831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000005930 + 6000005931.

It is an arithmetic number, because the mean of its divisors is an integer number (6000005931).

Almost surely, 2^12000011861 is an apocalyptic number.

It is an amenable number.

12000011861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12000011861 is an equidigital number, since it uses as much as digits as its factorization.

12000011861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 12000011861 its reverse (16811000021), we get a palindrome (28811011882).

The spelling of 12000011861 in words is "twelve billion, eleven thousand, eight hundred sixty-one".