201111312399857 has 2 divisors, whose sum is σ = 201111312399858. Its totient is φ = 201111312399856.

The previous prime is 201111312399707. The next prime is 201111312399863. The reversal of 201111312399857 is 758993213111102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163269080627041 + 37842231772816 = 12777679^2 + 6151604^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111312399857 - 2¹⁸ = 201111312137713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201111312399799 and 201111312399808.

It is not a weakly prime, because it can be changed into another prime (201111312399887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555656199928 + 100555656199929.

It is an arithmetic number, because the mean of its divisors is an integer number (100555656199929).

Almost surely, 2^{201111312399857} is an apocalyptic number.

It is an amenable number.

201111312399857 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111312399857 is an equidigital number, since it uses as much as digits as its factorization.

201111312399857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 201111312399857 in words is "two hundred one trillion, one hundred eleven billion, three hundred twelve million, three hundred ninety-nine thousand, eight hundred fifty-seven".