8161229369 has 2 divisors, whose sum is σ = 8161229370. Its totient is φ = 8161229368.

The previous prime is 8161229347. The next prime is 8161229383. The reversal of 8161229369 is 9639221618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7865561344 + 295668025 = 88688^2 + 17195^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161229369 - 2⁸ = 8161229113 is a prime.

It is a super-2 number, since 2×8161229369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8161229309) 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, 4080614684 + 4080614685.

It is an arithmetic number, because the mean of its divisors is an integer number (4080614685).

Almost surely, 2^8161229369 is an apocalyptic number.

It is an amenable number.

8161229369 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161229369 is an equidigital number, since it uses as much as digits as its factorization.

8161229369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 8161229369 is about 90339.5227406034. The cubic root of 8161229369 is about 2013.3465178630.

The spelling of 8161229369 in words is "eight billion, one hundred sixty-one million, two hundred twenty-nine thousand, three hundred sixty-nine".