201981281 has 2 divisors, whose sum is σ = 201981282. Its totient is φ = 201981280.

The previous prime is 201981253. The next prime is 201981289. The reversal of 201981281 is 182189102.

201981281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130325056 + 71656225 = 11416^2 + 8465^2 .

It is a cyclic number.

It is not a de Polignac number, because 201981281 - 2¹⁴ = 201964897 is a prime.

It is a super-2 number, since 2×201981281² = 81592875748801922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (201981289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100990640 + 100990641.

It is an arithmetic number, because the mean of its divisors is an integer number (100990641).

Almost surely, 2^201981281 is an apocalyptic number.

It is an amenable number.

201981281 is a deficient number, since it is larger than the sum of its proper divisors (1).

201981281 is an equidigital number, since it uses as much as digits as its factorization.

201981281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 201981281 is about 14212.0118561729. The cubic root of 201981281 is about 586.7283060163.

The spelling of 201981281 in words is "two hundred one million, nine hundred eighty-one thousand, two hundred eighty-one".