823609888181 has 2 divisors, whose sum is σ = 823609888182. Its totient is φ = 823609888180.

The previous prime is 823609888103. The next prime is 823609888253. The reversal of 823609888181 is 181888906328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 479784802225 + 343825085956 = 692665^2 + 586366^2 .

It is a cyclic number.

It is not a de Polignac number, because 823609888181 - 2³⁰ = 822536146357 is a prime.

It is a super-2 number, since 2×823609888181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823609882181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411804944090 + 411804944091.

It is an arithmetic number, because the mean of its divisors is an integer number (411804944091).

Almost surely, 2^823609888181 is an apocalyptic number.

It is an amenable number.

823609888181 is a deficient number, since it is larger than the sum of its proper divisors (1).

823609888181 is an equidigital number, since it uses as much as digits as its factorization.

823609888181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10616832, while the sum is 62.

The spelling of 823609888181 in words is "eight hundred twenty-three billion, six hundred nine million, eight hundred eighty-eight thousand, one hundred eighty-one".