6181908133 has 2 divisors, whose sum is σ = 6181908134. Its totient is φ = 6181908132.

The previous prime is 6181908097. The next prime is 6181908151. The reversal of 6181908133 is 3318091816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4551121444 + 1630786689 = 67462^2 + 40383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6181908133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6181908833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3090954066 + 3090954067.

It is an arithmetic number, because the mean of its divisors is an integer number (3090954067).

Almost surely, 2^6181908133 is an apocalyptic number.

It is an amenable number.

6181908133 is a deficient number, since it is larger than the sum of its proper divisors (1).

6181908133 is an equidigital number, since it uses as much as digits as its factorization.

6181908133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 6181908133 is about 78625.1113385539. Note that the first 3 decimals coincide. The cubic root of 6181908133 is about 1835.3019059915.

Adding to 6181908133 its reverse (3318091816), we get a palindrome (9499999949).

The spelling of 6181908133 in words is "six billion, one hundred eighty-one million, nine hundred eight thousand, one hundred thirty-three".