201091571 has 2 divisors, whose sum is σ = 201091572. Its totient is φ = 201091570.

The previous prime is 201091537. The next prime is 201091591. The reversal of 201091571 is 175190102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201091571 - 2¹⁸ = 200829427 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201091571.

It is not a weakly prime, because it can be changed into another prime (201091531) 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, 100545785 + 100545786.

It is an arithmetic number, because the mean of its divisors is an integer number (100545786).

Almost surely, 2^201091571 is an apocalyptic number.

201091571 is a deficient number, since it is larger than the sum of its proper divisors (1).

201091571 is an equidigital number, since it uses as much as digits as its factorization.

201091571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 201091571 is about 14180.6759711940. The cubic root of 201091571 is about 585.8655422309.

The spelling of 201091571 in words is "two hundred one million, ninety-one thousand, five hundred seventy-one".