201141781 has 2 divisors, whose sum is σ = 201141782. Its totient is φ = 201141780.

The previous prime is 201141769. The next prime is 201141817. The reversal of 201141781 is 187141102.

Together with next prime (201141817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190026225 + 11115556 = 13785^2 + 3334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201141781 is a prime.

It is a super-2 number, since 2×201141781² = 80916032127703922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201141751) 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, 100570890 + 100570891.

It is an arithmetic number, because the mean of its divisors is an integer number (100570891).

Almost surely, 2^201141781 is an apocalyptic number.

It is an amenable number.

201141781 is a deficient number, since it is larger than the sum of its proper divisors (1).

201141781 is an equidigital number, since it uses as much as digits as its factorization.

201141781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 201141781 is about 14182.4462276435. The cubic root of 201141781 is about 585.9142992238.

Adding to 201141781 its reverse (187141102), we get a palindrome (388282883).

The spelling of 201141781 in words is "two hundred one million, one hundred forty-one thousand, seven hundred eighty-one".