201820547 has 2 divisors, whose sum is σ = 201820548. Its totient is φ = 201820546.

The previous prime is 201820537. The next prime is 201820609. The reversal of 201820547 is 745028102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201820547 - 2¹² = 201816451 is a prime.

It is not a weakly prime, because it can be changed into another prime (201820537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100910273 + 100910274.

It is an arithmetic number, because the mean of its divisors is an integer number (100910274).

Almost surely, 2^201820547 is an apocalyptic number.

201820547 is a deficient number, since it is larger than the sum of its proper divisors (1).

201820547 is an equidigital number, since it uses as much as digits as its factorization.

201820547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 201820547 is about 14206.3558663015. The cubic root of 201820547 is about 586.5726278692.

Adding to 201820547 its reverse (745028102), we get a palindrome (946848649).

The spelling of 201820547 in words is "two hundred one million, eight hundred twenty thousand, five hundred forty-seven".