1165091285 has 4 divisors (see below), whose sum is σ = 1398109548. Its totient is φ = 932073024.

The previous prime is 1165091281. The next prime is 1165091297. The reversal of 1165091285 is 5821905611.

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 921668881 + 243422404 = 30359^2 + 15602^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165091285 - 2² = 1165091281 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165091281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116509124 + ... + 116509133.

It is an arithmetic number, because the mean of its divisors is an integer number (349527387).

Almost surely, 2^1165091285 is an apocalyptic number.

It is an amenable number.

1165091285 is a deficient number, since it is larger than the sum of its proper divisors (233018263).

1165091285 is an equidigital number, since it uses as much as digits as its factorization.

1165091285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233018262.

The product of its (nonzero) digits is 21600, while the sum is 38.

The square root of 1165091285 is about 34133.4335366368. The cubic root of 1165091285 is about 1052.2525444016.

Adding to 1165091285 its reverse (5821905611), we get a palindrome (6986996896).

The spelling of 1165091285 in words is "one billion, one hundred sixty-five million, ninety-one thousand, two hundred eighty-five".