201142561 has 2 divisors, whose sum is σ = 201142562. Its totient is φ = 201142560.

The previous prime is 201142553. The next prime is 201142631. The reversal of 201142561 is 165241102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168194961 + 32947600 = 12969^2 + 5740^2 .

It is a cyclic number.

It is not a de Polignac number, because 201142561 - 2³ = 201142553 is a prime.

It is not a weakly prime, because it can be changed into another prime (201142511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100571280 + 100571281.

It is an arithmetic number, because the mean of its divisors is an integer number (100571281).

Almost surely, 2^201142561 is an apocalyptic number.

It is an amenable number.

201142561 is a deficient number, since it is larger than the sum of its proper divisors (1).

201142561 is an equidigital number, since it uses as much as digits as its factorization.

201142561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 201142561 is about 14182.4737263991. The cubic root of 201142561 is about 585.9150565877.

Adding to 201142561 its reverse (165241102), we get a palindrome (366383663).

The spelling of 201142561 in words is "two hundred one million, one hundred forty-two thousand, five hundred sixty-one".