201281281 has 2 divisors, whose sum is σ = 201281282. Its totient is φ = 201281280.

The previous prime is 201281251. The next prime is 201281287. The reversal of 201281281 is 182182102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193210000 + 8071281 = 13900^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 201281281 - 2²³ = 192892673 is a prime.

It is a super-2 number, since 2×201281281² = 81028308162001922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201281287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100640640 + 100640641.

It is an arithmetic number, because the mean of its divisors is an integer number (100640641).

Almost surely, 2^201281281 is an apocalyptic number.

It is an amenable number.

201281281 is a deficient number, since it is larger than the sum of its proper divisors (1).

201281281 is an equidigital number, since it uses as much as digits as its factorization.

201281281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 201281281 is about 14187.3634266554. The cubic root of 201281281 is about 586.0497197152.

The spelling of 201281281 in words is "two hundred one million, two hundred eighty-one thousand, two hundred eighty-one".