8161208269 has 2 divisors, whose sum is σ = 8161208270. Its totient is φ = 8161208268.

The previous prime is 8161208203. The next prime is 8161208291. The reversal of 8161208269 is 9628021618.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7639634025 + 521574244 = 87405^2 + 22838^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161208269 - 2²¹ = 8159111117 is a prime.

It is a super-2 number, since 2×8161208269² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8161208569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080604134 + 4080604135.

It is an arithmetic number, because the mean of its divisors is an integer number (4080604135).

Almost surely, 2^8161208269 is an apocalyptic number.

It is an amenable number.

8161208269 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161208269 is an equidigital number, since it uses as much as digits as its factorization.

8161208269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 8161208269 is about 90339.4059588616. The cubic root of 8161208269 is about 2013.3447827630.

The spelling of 8161208269 in words is "eight billion, one hundred sixty-one million, two hundred eight thousand, two hundred sixty-nine".