160229981 has 18 divisors (see below), whose sum is σ = 174207150. Its totient is φ = 147336960.

The previous prime is 160229969. The next prime is 160229989. The reversal of 160229981 is 189922061.

It can be written as a sum of positive squares in 9 ways, for example, as 101324356 + 58905625 = 10066^2 + 7675^2 .

It is a de Polignac number, because none of the positive numbers 2^k-160229981 is a prime.

It is a super-2 number, since 2×160229981² = 51347293622520722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160229989) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1075295 + ... + 1075443.

It is an arithmetic number, because the mean of its divisors is an integer number (9678175).

Almost surely, 2^160229981 is an apocalyptic number.

It is an amenable number.

160229981 is a deficient number, since it is larger than the sum of its proper divisors (13977169).

160229981 is an equidigital number, since it uses as much as digits as its factorization.

160229981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 160229981 is about 12658.1981735158. The cubic root of 160229981 is about 543.1435089917.

The spelling of 160229981 in words is "one hundred sixty million, two hundred twenty-nine thousand, nine hundred eighty-one".