204145187 has 2 divisors, whose sum is σ = 204145188. Its totient is φ = 204145186.

The previous prime is 204145159. The next prime is 204145213. The reversal of 204145187 is 781541402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204145187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204145087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102072593 + 102072594.

It is an arithmetic number, because the mean of its divisors is an integer number (102072594).

Almost surely, 2^204145187 is an apocalyptic number.

204145187 is a deficient number, since it is larger than the sum of its proper divisors (1).

204145187 is an equidigital number, since it uses as much as digits as its factorization.

204145187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 204145187 is about 14287.9385147053. The cubic root of 204145187 is about 588.8161524591.

Adding to 204145187 its reverse (781541402), we get a palindrome (985686589).

The spelling of 204145187 in words is "two hundred four million, one hundred forty-five thousand, one hundred eighty-seven".