201001243 has 2 divisors, whose sum is σ = 201001244. Its totient is φ = 201001242.

The previous prime is 201001219. The next prime is 201001277. The reversal of 201001243 is 342100102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201001243 - 2⁹ = 201000731 is a prime.

It is not a weakly prime, because it can be changed into another prime (201001543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100500621 + 100500622.

It is an arithmetic number, because the mean of its divisors is an integer number (100500622).

Almost surely, 2^201001243 is an apocalyptic number.

201001243 is a deficient number, since it is larger than the sum of its proper divisors (1).

201001243 is an equidigital number, since it uses as much as digits as its factorization.

201001243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 201001243 is about 14177.4907159201. The cubic root of 201001243 is about 585.7778077590. Note that the first 3 decimals are identical.

Adding to 201001243 its reverse (342100102), we get a palindrome (543101345).

The spelling of 201001243 in words is "two hundred one million, one thousand, two hundred forty-three".