823609882181 has 2 divisors, whose sum is σ = 823609882182. Its totient is φ = 823609882180.

The previous prime is 823609882163. The next prime is 823609882223. The reversal of 823609882181 is 181288906328.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488658319681 + 334951562500 = 699041^2 + 578750^2 .

It is a cyclic number.

It is not a de Polignac number, because 823609882181 - 2¹⁸ = 823609620037 is a prime.

It is a super-4 number, since 4×823609882181⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823609885181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411804941090 + 411804941091.

It is an arithmetic number, because the mean of its divisors is an integer number (411804941091).

Almost surely, 2^823609882181 is an apocalyptic number.

It is an amenable number.

823609882181 is a deficient number, since it is larger than the sum of its proper divisors (1).

823609882181 is an equidigital number, since it uses as much as digits as its factorization.

823609882181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 56.

The spelling of 823609882181 in words is "eight hundred twenty-three billion, six hundred nine million, eight hundred eighty-two thousand, one hundred eighty-one".