1161828565 has 4 divisors (see below), whose sum is σ = 1394194284. Its totient is φ = 929462848.

The previous prime is 1161828557. The next prime is 1161828607. The reversal of 1161828565 is 5658281611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 270865764 + 890962801 = 16458^2 + 29849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161828565 - 2³ = 1161828557 is a prime.

It is a super-2 number, since 2×1161828565² = 2699691228899918450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116182852 + ... + 116182861.

It is an arithmetic number, because the mean of its divisors is an integer number (348548571).

Almost surely, 2^1161828565 is an apocalyptic number.

It is an amenable number.

1161828565 is a deficient number, since it is larger than the sum of its proper divisors (232365719).

1161828565 is an equidigital number, since it uses as much as digits as its factorization.

1161828565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232365718.

The product of its digits is 115200, while the sum is 43.

The square root of 1161828565 is about 34085.6064197192. The cubic root of 1161828565 is about 1051.2693838996.

The spelling of 1161828565 in words is "one billion, one hundred sixty-one million, eight hundred twenty-eight thousand, five hundred sixty-five".