201239971 has 2 divisors, whose sum is σ = 201239972. Its totient is φ = 201239970.

The previous prime is 201239959. The next prime is 201240029. The reversal of 201239971 is 179932102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201239971 - 2⁹ = 201239459 is a prime.

It is not a weakly prime, because it can be changed into another prime (201239921) 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, 100619985 + 100619986.

It is an arithmetic number, because the mean of its divisors is an integer number (100619986).

Almost surely, 2^201239971 is an apocalyptic number.

201239971 is a deficient number, since it is larger than the sum of its proper divisors (1).

201239971 is an equidigital number, since it uses as much as digits as its factorization.

201239971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 201239971 is about 14185.9074789031. The cubic root of 201239971 is about 586.0096242988.

The spelling of 201239971 in words is "two hundred one million, two hundred thirty-nine thousand, nine hundred seventy-one".