11161985 has 8 divisors (see below), whose sum is σ = 13415976. Its totient is φ = 8915200.

The previous prime is 11161967. The next prime is 11161991. The reversal of 11161985 is 58916111.

It can be written as a sum of positive squares in 4 ways, for example, as 1100401 + 10061584 = 1049^2 + 3172^2 .

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

It is not a de Polignac number, because 11161985 - 2⁶ = 11161921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2585 + ... + 5385.

It is an arithmetic number, because the mean of its divisors is an integer number (1676997).

Almost surely, 2^11161985 is an apocalyptic number.

It is an amenable number.

11161985 is a deficient number, since it is larger than the sum of its proper divisors (2253991).

11161985 is an equidigital number, since it uses as much as digits as its factorization.

11161985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603.

The product of its digits is 2160, while the sum is 32.

The square root of 11161985 is about 3340.9557015920. The cubic root of 11161985 is about 223.4843648090.

The spelling of 11161985 in words is "eleven million, one hundred sixty-one thousand, nine hundred eighty-five".