1165913263 has 4 divisors (see below), whose sum is σ = 1216605168. Its totient is φ = 1115221360.

The previous prime is 1165913251. The next prime is 1165913291. The reversal of 1165913263 is 3623195611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3623195611 = 7 ⋅517599373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165913263 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 (1165913293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25345918 + ... + 25345963.

It is an arithmetic number, because the mean of its divisors is an integer number (304151292).

Almost surely, 2^1165913263 is an apocalyptic number.

1165913263 is a deficient number, since it is larger than the sum of its proper divisors (50691905).

1165913263 is an equidigital number, since it uses as much as digits as its factorization.

1165913263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50691904.

The product of its digits is 29160, while the sum is 37.

The square root of 1165913263 is about 34145.4720717111. The cubic root of 1165913263 is about 1052.4999427898.

The spelling of 1165913263 in words is "one billion, one hundred sixty-five million, nine hundred thirteen thousand, two hundred sixty-three".