181768361 has 2 divisors, whose sum is σ = 181768362. Its totient is φ = 181768360.

The previous prime is 181768351. The next prime is 181768373. The reversal of 181768361 is 163867181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145347136 + 36421225 = 12056^2 + 6035^2 .

It is an emirp because it is prime and its reverse (163867181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181768361 - 2¹⁸ = 181506217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181768331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90884180 + 90884181.

It is an arithmetic number, because the mean of its divisors is an integer number (90884181).

Almost surely, 2^181768361 is an apocalyptic number.

It is an amenable number.

181768361 is a deficient number, since it is larger than the sum of its proper divisors (1).

181768361 is an equidigital number, since it uses as much as digits as its factorization.

181768361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 181768361 is about 13482.1497173114. The cubic root of 181768361 is about 566.4645856523.

The spelling of 181768361 in words is "one hundred eighty-one million, seven hundred sixty-eight thousand, three hundred sixty-one".