17212985 has 4 divisors (see below), whose sum is σ = 20655588. Its totient is φ = 13770384.

The previous prime is 17212961. The next prime is 17212991. The reversal of 17212985 is 58921271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58921271 = 1181 ⋅49891.

It can be written as a sum of positive squares in 2 ways, for example, as 5707321 + 11505664 = 2389^2 + 3392^2 .

It is a cyclic number.

It is not a de Polignac number, because 17212985 - 2²⁰ = 16164409 is a prime.

It is a super-2 number, since 2×17212985² = 592573705220450, which contains 22 as substring.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1721294 + ... + 1721303.

It is an arithmetic number, because the mean of its divisors is an integer number (5163897).

Almost surely, 2^17212985 is an apocalyptic number.

It is an amenable number.

17212985 is a deficient number, since it is larger than the sum of its proper divisors (3442603).

17212985 is an equidigital number, since it uses as much as digits as its factorization.

17212985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442602.

The product of its digits is 10080, while the sum is 35.

The square root of 17212985 is about 4148.8534560768. The cubic root of 17212985 is about 258.1975181575.

The spelling of 17212985 in words is "seventeen million, two hundred twelve thousand, nine hundred eighty-five".