201939844986917 has 8 divisors (see below), whose sum is σ = 202013479129176. Its totient is φ = 201866216753152.

The previous prime is 201939844986899. The next prime is 201939844986991. The reversal of 201939844986917 is 719689448939102.

It is a Cunningham number, because it is equal to 14210554²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 94261845993316 + 107677998993601 = 9708854^2 + 10376801^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201939844986917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201939841986917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67477283 + ... + 70406415.

It is an arithmetic number, because the mean of its divisors is an integer number (25251684891147).

Almost surely, 2^{201939844986917} is an apocalyptic number.

It is an amenable number.

201939844986917 is a deficient number, since it is larger than the sum of its proper divisors (73634142259).

201939844986917 is a wasteful number, since it uses less digits than its factorization.

201939844986917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954247.

The product of its (nonzero) digits is 1693052928, while the sum is 80.

The spelling of 201939844986917 in words is "two hundred one trillion, nine hundred thirty-nine billion, eight hundred forty-four million, nine hundred eighty-six thousand, nine hundred seventeen".