1161523217 has 2 divisors, whose sum is σ = 1161523218. Its totient is φ = 1161523216.

The previous prime is 1161523201. The next prime is 1161523241. The reversal of 1161523217 is 7123251611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1131918736 + 29604481 = 33644^2 + 5441^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161523217 - 2⁴ = 1161523201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161523217.

It is not a weakly prime, because it can be changed into another prime (1161523117) 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, 580761608 + 580761609.

It is an arithmetic number, because the mean of its divisors is an integer number (580761609).

Almost surely, 2^1161523217 is an apocalyptic number.

It is an amenable number.

1161523217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161523217 is an equidigital number, since it uses as much as digits as its factorization.

1161523217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 1161523217 is about 34081.1269913423. The cubic root of 1161523217 is about 1051.1772787648.

Adding to 1161523217 its reverse (7123251611), we get a palindrome (8284774828).

The spelling of 1161523217 in words is "one billion, one hundred sixty-one million, five hundred twenty-three thousand, two hundred seventeen".