1085782861 has 4 divisors (see below), whose sum is σ = 1108884672. Its totient is φ = 1062681052.

The previous prime is 1085782813. The next prime is 1085782883. The reversal of 1085782861 is 1682875801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1682875801 = 683 ⋅2463947.

It is a cyclic number.

It is not a de Polignac number, because 1085782861 - 2⁹ = 1085782349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1085782561) 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 3 ways as a sum of consecutive naturals, for example, 11550835 + ... + 11550928.

It is an arithmetic number, because the mean of its divisors is an integer number (277221168).

Almost surely, 2^1085782861 is an apocalyptic number.

It is an amenable number.

1085782861 is a deficient number, since it is larger than the sum of its proper divisors (23101811).

1085782861 is an equidigital number, since it uses as much as digits as its factorization.

1085782861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23101810.

The product of its (nonzero) digits is 215040, while the sum is 46.

The square root of 1085782861 is about 32951.2194159791. The cubic root of 1085782861 is about 1027.8135228405.

The spelling of 1085782861 in words is "one billion, eighty-five million, seven hundred eighty-two thousand, eight hundred sixty-one".