201018197 has 2 divisors, whose sum is σ = 201018198. Its totient is φ = 201018196.

The previous prime is 201018193. The next prime is 201018269. The reversal of 201018197 is 791810102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107972881 + 93045316 = 10391^2 + 9646^2 .

It is a cyclic number.

It is not a de Polignac number, because 201018197 - 2² = 201018193 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201018193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100509098 + 100509099.

It is an arithmetic number, because the mean of its divisors is an integer number (100509099).

Almost surely, 2^201018197 is an apocalyptic number.

It is an amenable number.

201018197 is a deficient number, since it is larger than the sum of its proper divisors (1).

201018197 is an equidigital number, since it uses as much as digits as its factorization.

201018197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 201018197 is about 14178.0886229421. The cubic root of 201018197 is about 585.7942769734.

Adding to 201018197 its reverse (791810102), we get a palindrome (992828299).

The spelling of 201018197 in words is "two hundred one million, eighteen thousand, one hundred ninety-seven".