201971971 has 8 divisors (see below), whose sum is σ = 203747040. Its totient is φ = 200203968.

The previous prime is 201971963. The next prime is 201971999. The reversal of 201971971 is 179179102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201971971 - 2³ = 201971963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201971971.

It is not an unprimeable number, because it can be changed into a prime (201971911) 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 in 7 ways as a sum of consecutive naturals, for example, 66825 + ... + 69781.

It is an arithmetic number, because the mean of its divisors is an integer number (25468380).

Almost surely, 2^201971971 is an apocalyptic number.

201971971 is a deficient number, since it is larger than the sum of its proper divisors (1775069).

201971971 is a wasteful number, since it uses less digits than its factorization.

201971971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533.

The product of its (nonzero) digits is 7938, while the sum is 37.

The square root of 201971971 is about 14211.6843125648. The cubic root of 201971971 is about 586.7192911142.

The spelling of 201971971 in words is "two hundred one million, nine hundred seventy-one thousand, nine hundred seventy-one".