160217681 has 4 divisors (see below), whose sum is σ = 172542132. Its totient is φ = 147893232.

The previous prime is 160217669. The next prime is 160217731. The reversal of 160217681 is 186712061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186712061 = 13523 ⋅13807.

It can be written as a sum of positive squares in 2 ways, for example, as 49126081 + 111091600 = 7009^2 + 10540^2 .

It is a cyclic number.

It is not a de Polignac number, because 160217681 - 2¹⁰ = 160216657 is a prime.

It is a super-2 number, since 2×160217681² = 51339410610035522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (160217621) 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, 6162206 + ... + 6162231.

It is an arithmetic number, because the mean of its divisors is an integer number (43135533).

Almost surely, 2^160217681 is an apocalyptic number.

It is an amenable number.

160217681 is a deficient number, since it is larger than the sum of its proper divisors (12324451).

160217681 is a wasteful number, since it uses less digits than its factorization.

160217681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12324450.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 160217681 is about 12657.7123130525. The cubic root of 160217681 is about 543.1296105605.

The spelling of 160217681 in words is "one hundred sixty million, two hundred seventeen thousand, six hundred eighty-one".