201987617 has 6 divisors (see below), whose sum is σ = 218720502. Its totient is φ = 186449952.

The previous prime is 201987593. The next prime is 201987619. The reversal of 201987617 is 716789102.

It can be written as a sum of positive squares in 3 ways, for example, as 17272336 + 184715281 = 4156^2 + 13591^2 .

It is not a de Polignac number, because 201987617 - 2¹⁰ = 201986593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201987619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 597428 + ... + 597765.

It is an arithmetic number, because the mean of its divisors is an integer number (36453417).

Almost surely, 2^201987617 is an apocalyptic number.

It is an amenable number.

201987617 is a deficient number, since it is larger than the sum of its proper divisors (16732885).

201987617 is a wasteful number, since it uses less digits than its factorization.

201987617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195219 (or 1195206 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 201987617 is about 14212.2347644556. The cubic root of 201987617 is about 586.7344410266.

The spelling of 201987617 in words is "two hundred one million, nine hundred eighty-seven thousand, six hundred seventeen".