201641617 has 2 divisors, whose sum is σ = 201641618. Its totient is φ = 201641616.

The previous prime is 201641597. The next prime is 201641681. The reversal of 201641617 is 716146102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197796096 + 3845521 = 14064^2 + 1961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201641617 is a prime.

It is not a weakly prime, because it can be changed into another prime (201641317) 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, 100820808 + 100820809.

It is an arithmetic number, because the mean of its divisors is an integer number (100820809).

Almost surely, 2^201641617 is an apocalyptic number.

It is an amenable number.

201641617 is a deficient number, since it is larger than the sum of its proper divisors (1).

201641617 is an equidigital number, since it uses as much as digits as its factorization.

201641617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 201641617 is about 14200.0569365056. The cubic root of 201641617 is about 586.3992288203.

Adding to 201641617 its reverse (716146102), we get a palindrome (917787719).

The spelling of 201641617 in words is "two hundred one million, six hundred forty-one thousand, six hundred seventeen".