1169221561 has 2 divisors, whose sum is σ = 1169221562. Its totient is φ = 1169221560.

The previous prime is 1169221549. The next prime is 1169221621. The reversal of 1169221561 is 1651229611.

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., 1061456400 + 107765161 = 32580^2 + 10381^2 .

It is an emirp because it is prime and its reverse (1651229611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1169221561 - 2⁷ = 1169221433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1169221511) 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, 584610780 + 584610781.

It is an arithmetic number, because the mean of its divisors is an integer number (584610781).

Almost surely, 2^1169221561 is an apocalyptic number.

It is an amenable number.

1169221561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1169221561 is an equidigital number, since it uses as much as digits as its factorization.

1169221561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 1169221561 is about 34193.8819235254. The cubic root of 1169221561 is about 1053.4944979747.

The spelling of 1169221561 in words is "one billion, one hundred sixty-nine million, two hundred twenty-one thousand, five hundred sixty-one".