201997571 has 2 divisors, whose sum is σ = 201997572. Its totient is φ = 201997570.

The previous prime is 201997547. The next prime is 201997591. The reversal of 201997571 is 175799102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201997571 - 2⁶ = 201997507 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201997501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100998785 + 100998786.

It is an arithmetic number, because the mean of its divisors is an integer number (100998786).

Almost surely, 2^201997571 is an apocalyptic number.

201997571 is a deficient number, since it is larger than the sum of its proper divisors (1).

201997571 is an equidigital number, since it uses as much as digits as its factorization.

201997571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 201997571 is about 14212.5849513732. The cubic root of 201997571 is about 586.7440790080.

The spelling of 201997571 in words is "two hundred one million, nine hundred ninety-seven thousand, five hundred seventy-one".