8163145181 has 2 divisors, whose sum is σ = 8163145182. Its totient is φ = 8163145180.

The previous prime is 8163145147. The next prime is 8163145183. The reversal of 8163145181 is 1815413618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6458693956 + 1704451225 = 80366^2 + 41285^2 .

It is a cyclic number.

It is not a de Polignac number, because 8163145181 - 2⁶ = 8163145117 is a prime.

It is a super-2 number, since 2×8163145181² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 8163145183, it forms a pair of twin primes.

It is a Chen 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 (8163145183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4081572590 + 4081572591.

It is an arithmetic number, because the mean of its divisors is an integer number (4081572591).

Almost surely, 2^8163145181 is an apocalyptic number.

It is an amenable number.

8163145181 is a deficient number, since it is larger than the sum of its proper divisors (1).

8163145181 is an equidigital number, since it uses as much as digits as its factorization.

8163145181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 38.

The square root of 8163145181 is about 90350.1255173450. The cubic root of 8163145181 is about 2013.5040468931.

Adding to 8163145181 its reverse (1815413618), we get a palindrome (9978558799).

The spelling of 8163145181 in words is "eight billion, one hundred sixty-three million, one hundred forty-five thousand, one hundred eighty-one".