204778043 has 2 divisors, whose sum is σ = 204778044. Its totient is φ = 204778042.

The previous prime is 204778031. The next prime is 204778051. The reversal of 204778043 is 340877402.

204778043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204778043 - 2⁴ = 204778027 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 204777994 and 204778012.

It is not a weakly prime, because it can be changed into another prime (204778003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102389021 + 102389022.

It is an arithmetic number, because the mean of its divisors is an integer number (102389022).

Almost surely, 2^204778043 is an apocalyptic number.

204778043 is a deficient number, since it is larger than the sum of its proper divisors (1).

204778043 is an equidigital number, since it uses as much as digits as its factorization.

204778043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 204778043 is about 14310.0678894267. The cubic root of 204778043 is about 589.4239738526.

The spelling of 204778043 in words is "two hundred four million, seven hundred seventy-eight thousand, forty-three".