201442161 has 16 divisors (see below), whose sum is σ = 284221440. Its totient is φ = 126553680.

The previous prime is 201442121. The next prime is 201442183. The reversal of 201442161 is 161244102.

It is a happy number.

It is not a de Polignac number, because 201442161 - 2¹⁸ = 201180017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201442121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1636 + ... + 20138.

It is an arithmetic number, because the mean of its divisors is an integer number (17763840).

Almost surely, 2^201442161 is an apocalyptic number.

It is an amenable number.

201442161 is a deficient number, since it is larger than the sum of its proper divisors (82779279).

201442161 is a wasteful number, since it uses less digits than its factorization.

201442161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18716.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 201442161 is about 14193.0321284777. The cubic root of 201442161 is about 586.2058173082.

Adding to 201442161 its reverse (161244102), we get a palindrome (362686263).

The spelling of 201442161 in words is "two hundred one million, four hundred forty-two thousand, one hundred sixty-one".