1165765531 has 16 divisors (see below), whose sum is σ = 1411651584. Its totient is φ = 939798144.

The previous prime is 1165765529. The next prime is 1165765589. The reversal of 1165765531 is 1355675611.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1165765531 - 2¹ = 1165765529 is a prime.

It is a super-2 number, since 2×1165765531² = 2718018546535423922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1165765831) 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 15 ways as a sum of consecutive naturals, for example, 245526 + ... + 250228.

It is an arithmetic number, because the mean of its divisors is an integer number (88228224).

Almost surely, 2^1165765531 is an apocalyptic number.

1165765531 is a deficient number, since it is larger than the sum of its proper divisors (245886053).

1165765531 is a wasteful number, since it uses less digits than its factorization.

1165765531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810.

The product of its digits is 94500, while the sum is 40.

The square root of 1165765531 is about 34143.3087295300. The cubic root of 1165765531 is about 1052.4554870845.

The spelling of 1165765531 in words is "one billion, one hundred sixty-five million, seven hundred sixty-five thousand, five hundred thirty-one".