5185408181 has 2 divisors, whose sum is σ = 5185408182. Its totient is φ = 5185408180.

The previous prime is 5185408177. The next prime is 5185408271. The reversal of 5185408181 is 1818045815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845116081 + 1340292100 = 62009^2 + 36610^2 .

It is a cyclic number.

It is not a de Polignac number, because 5185408181 - 2² = 5185408177 is a prime.

It is a super-2 number, since 2×5185408181² = 53776916007163457522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5185408171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2592704090 + 2592704091.

It is an arithmetic number, because the mean of its divisors is an integer number (2592704091).

Almost surely, 2^5185408181 is an apocalyptic number.

It is an amenable number.

5185408181 is a deficient number, since it is larger than the sum of its proper divisors (1).

5185408181 is an equidigital number, since it uses as much as digits as its factorization.

5185408181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51200, while the sum is 41.

The square root of 5185408181 is about 72009.7783707185. The cubic root of 5185408181 is about 1730.8561791663.

The spelling of 5185408181 in words is "five billion, one hundred eighty-five million, four hundred eight thousand, one hundred eighty-one".