1165622321 has 2 divisors, whose sum is σ = 1165622322. Its totient is φ = 1165622320.

The previous prime is 1165622299. The next prime is 1165622363. The reversal of 1165622321 is 1232265611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733813921 + 431808400 = 27089^2 + 20780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165622321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165621321) 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, 582811160 + 582811161.

It is an arithmetic number, because the mean of its divisors is an integer number (582811161).

Almost surely, 2^1165622321 is an apocalyptic number.

It is an amenable number.

1165622321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165622321 is an equidigital number, since it uses as much as digits as its factorization.

1165622321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 1165622321 is about 34141.2114752831. The cubic root of 1165622321 is about 1052.4123885600.

Adding to 1165622321 its reverse (1232265611), we get a palindrome (2397887932).

The spelling of 1165622321 in words is "one billion, one hundred sixty-five million, six hundred twenty-two thousand, three hundred twenty-one".