1085866381 has 8 divisors (see below), whose sum is σ = 1159917624. Its totient is φ = 1012945920.

The previous prime is 1085866367. The next prime is 1085866399. The reversal of 1085866381 is 1836685801.

It can be written as a sum of positive squares in 4 ways, for example, as 756900 + 1085109481 = 870^2 + 32941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1085866381 - 2⁵ = 1085866349 is a prime.

It is a super-2 number, since 2×1085866381² = 2358211594772074322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1085866081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280710 + ... + 284551.

It is an arithmetic number, because the mean of its divisors is an integer number (144989703).

Almost surely, 2^1085866381 is an apocalyptic number.

It is an amenable number.

1085866381 is a deficient number, since it is larger than the sum of its proper divisors (74051243).

1085866381 is a wasteful number, since it uses less digits than its factorization.

1085866381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565391.

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 1085866381 is about 32952.4867195178. The cubic root of 1085866381 is about 1027.8398758028.

The spelling of 1085866381 in words is "one billion, eighty-five million, eight hundred sixty-six thousand, three hundred eighty-one".