10861985 has 4 divisors (see below), whose sum is σ = 13034388. Its totient is φ = 8689584.

The previous prime is 10861969. The next prime is 10861993. The reversal of 10861985 is 58916801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58916801 = 1733 ⋅33997.

It can be written as a sum of positive squares in 2 ways, for example, as 5740816 + 5121169 = 2396^2 + 2263^2 .

It is a cyclic number.

It is not a de Polignac number, because 10861985 - 2⁴ = 10861969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1086194 + ... + 1086203.

It is an arithmetic number, because the mean of its divisors is an integer number (3258597).

Almost surely, 2^10861985 is an apocalyptic number.

It is an amenable number.

10861985 is a deficient number, since it is larger than the sum of its proper divisors (2172403).

10861985 is an equidigital number, since it uses as much as digits as its factorization.

10861985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172402.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 10861985 is about 3295.7525695962. The cubic root of 10861985 is about 221.4639625310.

The spelling of 10861985 in words is "ten million, eight hundred sixty-one thousand, nine hundred eighty-five".