1165086961 has 4 divisors (see below), whose sum is σ = 1165155300. Its totient is φ = 1165018624.

The previous prime is 1165086947. The next prime is 1165086971. The reversal of 1165086961 is 1696805611.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1696805611 = 23 ⋅73774157.

It can be written as a sum of positive squares in 2 ways, for example, as 292239025 + 872847936 = 17095^2 + 29544^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165086961 - 2¹¹ = 1165084913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165086971) 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, 14745 + ... + 50473.

It is an arithmetic number, because the mean of its divisors is an integer number (291288825).

Almost surely, 2^1165086961 is an apocalyptic number.

It is an amenable number.

1165086961 is a deficient number, since it is larger than the sum of its proper divisors (68339).

1165086961 is an equidigital number, since it uses as much as digits as its factorization.

1165086961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68338.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1165086961 is about 34133.3701969202. The cubic root of 1165086961 is about 1052.2512426594.

The spelling of 1165086961 in words is "one billion, one hundred sixty-five million, eighty-six thousand, nine hundred sixty-one".