201166571 has 2 divisors, whose sum is σ = 201166572. Its totient is φ = 201166570.

The previous prime is 201166561. The next prime is 201166573. The reversal of 201166571 is 175661102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201166571 - 2¹⁸ = 200904427 is a prime.

It is a Sophie Germain prime.

Together with 201166573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201166573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100583285 + 100583286.

It is an arithmetic number, because the mean of its divisors is an integer number (100583286).

Almost surely, 2^201166571 is an apocalyptic number.

201166571 is a deficient number, since it is larger than the sum of its proper divisors (1).

201166571 is an equidigital number, since it uses as much as digits as its factorization.

201166571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 201166571 is about 14183.3201684232. The cubic root of 201166571 is about 585.9383688440.

The spelling of 201166571 in words is "two hundred one million, one hundred sixty-six thousand, five hundred seventy-one".