6180191861 has 2 divisors, whose sum is σ = 6180191862. Its totient is φ = 6180191860.

The previous prime is 6180191851. The next prime is 6180191909. The reversal of 6180191861 is 1681910816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6040242961 + 139948900 = 77719^2 + 11830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6180191861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6180191851) 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 as a sum of consecutive naturals, namely, 3090095930 + 3090095931.

It is an arithmetic number, because the mean of its divisors is an integer number (3090095931).

Almost surely, 2^6180191861 is an apocalyptic number.

It is an amenable number.

6180191861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6180191861 is an equidigital number, since it uses as much as digits as its factorization.

6180191861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 6180191861 is about 78614.1963070284. The cubic root of 6180191861 is about 1835.1320464191.

The spelling of 6180191861 in words is "six billion, one hundred eighty million, one hundred ninety-one thousand, eight hundred sixty-one".