201240161 has 2 divisors, whose sum is σ = 201240162. Its totient is φ = 201240160.

The previous prime is 201240157. The next prime is 201240163. The reversal of 201240161 is 161042102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166900561 + 34339600 = 12919^2 + 5860^2 .

It is a cyclic number.

It is not a de Polignac number, because 201240161 - 2² = 201240157 is a prime.

Together with 201240163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201240163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100620080 + 100620081.

It is an arithmetic number, because the mean of its divisors is an integer number (100620081).

Almost surely, 2^201240161 is an apocalyptic number.

It is an amenable number.

201240161 is a deficient number, since it is larger than the sum of its proper divisors (1).

201240161 is an equidigital number, since it uses as much as digits as its factorization.

201240161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 201240161 is about 14185.9141756885. The cubic root of 201240161 is about 586.0098087251.

Adding to 201240161 its reverse (161042102), we get a palindrome (362282263).

The spelling of 201240161 in words is "two hundred one million, two hundred forty thousand, one hundred sixty-one".