201243113 has 2 divisors, whose sum is σ = 201243114. Its totient is φ = 201243112.

The previous prime is 201243109. The next prime is 201243131. The reversal of 201243113 is 311342102.

Together with next prime (201243131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163149529 + 38093584 = 12773^2 + 6172^2 .

It is a cyclic number.

It is not a de Polignac number, because 201243113 - 2² = 201243109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201243091 and 201243100.

It is not a weakly prime, because it can be changed into another prime (201243313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100621556 + 100621557.

It is an arithmetic number, because the mean of its divisors is an integer number (100621557).

Almost surely, 2^201243113 is an apocalyptic number.

It is an amenable number.

201243113 is a deficient number, since it is larger than the sum of its proper divisors (1).

201243113 is an equidigital number, since it uses as much as digits as its factorization.

201243113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 201243113 is about 14186.0182221792. The cubic root of 201243113 is about 586.0126741115.

Adding to 201243113 its reverse (311342102), we get a palindrome (512585215).

The spelling of 201243113 in words is "two hundred one million, two hundred forty-three thousand, one hundred thirteen".