1165808531 has 2 divisors, whose sum is σ = 1165808532. Its totient is φ = 1165808530.

The previous prime is 1165808513. The next prime is 1165808533. The reversal of 1165808531 is 1358085611.

It is a happy number.

Together with previous prime (1165808513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1165808531 - 2³⁰ = 92066707 is a prime.

It is a super-2 number, since 2×1165808531² = 2718219061904755922, which contains 22 as substring.

Together with 1165808533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1165808533) 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 as a sum of consecutive naturals, namely, 582904265 + 582904266.

It is an arithmetic number, because the mean of its divisors is an integer number (582904266).

Almost surely, 2^1165808531 is an apocalyptic number.

1165808531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165808531 is an equidigital number, since it uses as much as digits as its factorization.

1165808531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 1165808531 is about 34143.9384225077. The cubic root of 1165808531 is about 1052.4684270878.

The spelling of 1165808531 in words is "one billion, one hundred sixty-five million, eight hundred eight thousand, five hundred thirty-one".