1131565665 has 16 divisors (see below), whose sum is σ = 1818281088. Its totient is φ = 600909696.

The previous prime is 1131565639. The next prime is 1131565667. The reversal of 1131565665 is 5665651311.

It is not a de Polignac number, because 1131565665 - 2¹⁰ = 1131564641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131565667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158389 + ... + 165378.

It is an arithmetic number, because the mean of its divisors is an integer number (113642568).

Almost surely, 2^1131565665 is an apocalyptic number.

1131565665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131565665 is a deficient number, since it is larger than the sum of its proper divisors (686715423).

1131565665 is a wasteful number, since it uses less digits than its factorization.

1131565665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324008.

The product of its digits is 81000, while the sum is 39.

The square root of 1131565665 is about 33638.7524293039. The cubic root of 1131565665 is about 1042.0612672323.

The spelling of 1131565665 in words is "one billion, one hundred thirty-one million, five hundred sixty-five thousand, six hundred sixty-five".