10216985 has 4 divisors (see below), whose sum is σ = 12260388. Its totient is φ = 8173584.

The previous prime is 10216981. The next prime is 10217029. The reversal of 10216985 is 58961201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1567504 + 8649481 = 1252^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 10216985 - 2² = 10216981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10216981) by changing a digit.

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, 1021694 + ... + 1021703.

It is an arithmetic number, because the mean of its divisors is an integer number (3065097).

Almost surely, 2^10216985 is an apocalyptic number.

It is an amenable number.

10216985 is a deficient number, since it is larger than the sum of its proper divisors (2043403).

10216985 is an equidigital number, since it uses as much as digits as its factorization.

10216985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043402.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 10216985 is about 3196.4018833682. The cubic root of 10216985 is about 216.9905989542.

The spelling of 10216985 in words is "ten million, two hundred sixteen thousand, nine hundred eighty-five".