201091871 has 2 divisors, whose sum is σ = 201091872. Its totient is φ = 201091870.

The previous prime is 201091817. The next prime is 201091901. The reversal of 201091871 is 178190102.

Together with previous prime (201091817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201091871 - 2¹⁴ = 201075487 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201091571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100545935 + 100545936.

It is an arithmetic number, because the mean of its divisors is an integer number (100545936).

Almost surely, 2^201091871 is an apocalyptic number.

201091871 is a deficient number, since it is larger than the sum of its proper divisors (1).

201091871 is an equidigital number, since it uses as much as digits as its factorization.

201091871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 201091871 is about 14180.6865489651. The cubic root of 201091871 is about 585.8658335734.

The spelling of 201091871 in words is "two hundred one million, ninety-one thousand, eight hundred seventy-one".