201800491 has 2 divisors, whose sum is σ = 201800492. Its totient is φ = 201800490.

The previous prime is 201800471. The next prime is 201800497. The reversal of 201800491 is 194008102.

It is a happy number.

201800491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201800491 is a prime.

It is not a weakly prime, because it can be changed into another prime (201800497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100900245 + 100900246.

It is an arithmetic number, because the mean of its divisors is an integer number (100900246).

Almost surely, 2^201800491 is an apocalyptic number.

201800491 is a deficient number, since it is larger than the sum of its proper divisors (1).

201800491 is an equidigital number, since it uses as much as digits as its factorization.

201800491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 201800491 is about 14205.6499675305. The cubic root of 201800491 is about 586.5531969267.

Adding to 201800491 its reverse (194008102), we get a palindrome (395808593).

The spelling of 201800491 in words is "two hundred one million, eight hundred thousand, four hundred ninety-one".