204939401 has 2 divisors, whose sum is σ = 204939402. Its totient is φ = 204939400.

The previous prime is 204939389. The next prime is 204939421. The reversal of 204939401 is 104939402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180929401 + 24010000 = 13451^2 + 4900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204939401 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (204939421) 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, 102469700 + 102469701.

It is an arithmetic number, because the mean of its divisors is an integer number (102469701).

Almost surely, 2^204939401 is an apocalyptic number.

It is an amenable number.

204939401 is a deficient number, since it is larger than the sum of its proper divisors (1).

204939401 is an equidigital number, since it uses as much as digits as its factorization.

204939401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 204939401 is about 14315.7046979882. The cubic root of 204939401 is about 589.5787484278.

Subtracting from 204939401 its reverse (104939402), we obtain a palindrome (99999999).

The spelling of 204939401 in words is "two hundred four million, nine hundred thirty-nine thousand, four hundred one".