201031331117 has 2 divisors, whose sum is σ = 201031331118. Its totient is φ = 201031331116.

The previous prime is 201031331113. The next prime is 201031331131. The reversal of 201031331117 is 711133130102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119498810596 + 81532520521 = 345686^2 + 285539^2 .

It is a cyclic number.

It is not a de Polignac number, because 201031331117 - 2² = 201031331113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201031331092 and 201031331101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201031331113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100515665558 + 100515665559.

It is an arithmetic number, because the mean of its divisors is an integer number (100515665559).

Almost surely, 2^201031331117 is an apocalyptic number.

It is an amenable number.

201031331117 is a deficient number, since it is larger than the sum of its proper divisors (1).

201031331117 is an equidigital number, since it uses as much as digits as its factorization.

201031331117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

Adding to 201031331117 its reverse (711133130102), we get a palindrome (912164461219).

The spelling of 201031331117 in words is "two hundred one billion, thirty-one million, three hundred thirty-one thousand, one hundred seventeen".