181278482069 has 2 divisors, whose sum is σ = 181278482070. Its totient is φ = 181278482068.

The previous prime is 181278482017. The next prime is 181278482081. The reversal of 181278482069 is 960284872181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180571453969 + 707028100 = 424937^2 + 26590^2 .

It is an emirp because it is prime and its reverse (960284872181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181278482069 is a prime.

It is a super-2 number, since 2×181278482069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181278482009) 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, 90639241034 + 90639241035.

It is an arithmetic number, because the mean of its divisors is an integer number (90639241035).

Almost surely, 2^181278482069 is an apocalyptic number.

It is an amenable number.

181278482069 is a deficient number, since it is larger than the sum of its proper divisors (1).

181278482069 is an equidigital number, since it uses as much as digits as its factorization.

181278482069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 56.

The spelling of 181278482069 in words is "one hundred eighty-one billion, two hundred seventy-eight million, four hundred eighty-two thousand, sixty-nine".