1165528813 has 4 divisors (see below), whose sum is σ = 1166174208. Its totient is φ = 1164883420.

The previous prime is 1165528811. The next prime is 1165528831. The reversal of 1165528813 is 3188255611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1165528813 - 2¹ = 1165528811 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165528811) 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 in 3 ways as a sum of consecutive naturals, for example, 319981 + ... + 323602.

It is an arithmetic number, because the mean of its divisors is an integer number (291543552).

Almost surely, 2^1165528813 is an apocalyptic number.

It is an amenable number.

1165528813 is a deficient number, since it is larger than the sum of its proper divisors (645395).

1165528813 is an equidigital number, since it uses as much as digits as its factorization.

1165528813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645394.

The product of its digits is 57600, while the sum is 40.

The square root of 1165528813 is about 34139.8420177950. The cubic root of 1165528813 is about 1052.3842457653.

The spelling of 1165528813 in words is "one billion, one hundred sixty-five million, five hundred twenty-eight thousand, eight hundred thirteen".