204404254487 has 2 divisors, whose sum is σ = 204404254488. Its totient is φ = 204404254486.

The previous prime is 204404254471. The next prime is 204404254489. The reversal of 204404254487 is 784452404402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204404254487 - 2⁴ = 204404254471 is a prime.

It is a super-3 number, since 3×204404254487³ (a number of 35 digits) contains 333 as substring.

Together with 204404254489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204404254489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102202127243 + 102202127244.

It is an arithmetic number, because the mean of its divisors is an integer number (102202127244).

Almost surely, 2^204404254487 is an apocalyptic number.

204404254487 is a deficient number, since it is larger than the sum of its proper divisors (1).

204404254487 is an equidigital number, since it uses as much as digits as its factorization.

204404254487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1146880, while the sum is 44.

Adding to 204404254487 its reverse (784452404402), we get a palindrome (988856658889).

The spelling of 204404254487 in words is "two hundred four billion, four hundred four million, two hundred fifty-four thousand, four hundred eighty-seven".