1165501321 has 2 divisors, whose sum is σ = 1165501322. Its totient is φ = 1165501320.

The previous prime is 1165501313. The next prime is 1165501339. The reversal of 1165501321 is 1231055611.

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., 693742921 + 471758400 = 26339^2 + 21720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165501321 - 2³ = 1165501313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165501361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582750660 + 582750661.

It is an arithmetic number, because the mean of its divisors is an integer number (582750661).

Almost surely, 2^1165501321 is an apocalyptic number.

It is an amenable number.

1165501321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165501321 is an equidigital number, since it uses as much as digits as its factorization.

1165501321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1165501321 is about 34139.4393773536. The cubic root of 1165501321 is about 1052.3759713023.

Adding to 1165501321 its reverse (1231055611), we get a palindrome (2396556932).

The spelling of 1165501321 in words is "one billion, one hundred sixty-five million, five hundred one thousand, three hundred twenty-one".