1091336865 has 32 divisors (see below), whose sum is σ = 1833062400. Its totient is φ = 553709760.

The previous prime is 1091336849. The next prime is 1091336887. The reversal of 1091336865 is 5686331901.

It is a happy number.

It is not a de Polignac number, because 1091336865 - 2⁴ = 1091336849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7546 + ... + 47324.

It is an arithmetic number, because the mean of its divisors is an integer number (57283200).

Almost surely, 2^1091336865 is an apocalyptic number.

1091336865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1091336865 is a deficient number, since it is larger than the sum of its proper divisors (741725535).

1091336865 is a wasteful number, since it uses less digits than its factorization.

1091336865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39877.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1091336865 is about 33035.3880709763. The cubic root of 1091336865 is about 1029.5630361287.

The spelling of 1091336865 in words is "one billion, ninety-one million, three hundred thirty-six thousand, eight hundred sixty-five".