201648217 has 4 divisors (see below), whose sum is σ = 203644836. Its totient is φ = 199651600.

The previous prime is 201648193. The next prime is 201648247. The reversal of 201648217 is 712846102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712846102 = 2 ⋅356423051.

It can be written as a sum of positive squares in 2 ways, for example, as 195552256 + 6095961 = 13984^2 + 2469^2 .

It is a cyclic number.

It is not a de Polignac number, because 201648217 - 2⁷ = 201648089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201648247) 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 3 ways as a sum of consecutive naturals, for example, 998158 + ... + 998359.

It is an arithmetic number, because the mean of its divisors is an integer number (50911209).

Almost surely, 2^201648217 is an apocalyptic number.

It is an amenable number.

201648217 is a deficient number, since it is larger than the sum of its proper divisors (1996619).

201648217 is a wasteful number, since it uses less digits than its factorization.

201648217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996618.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 201648217 is about 14200.2893280384. The cubic root of 201648217 is about 586.4056266277.

The spelling of 201648217 in words is "two hundred one million, six hundred forty-eight thousand, two hundred seventeen".