204454139 has 2 divisors, whose sum is σ = 204454140. Its totient is φ = 204454138.

The previous prime is 204454123. The next prime is 204454157. The reversal of 204454139 is 931454402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204454139 - 2⁴ = 204454123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204454109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102227069 + 102227070.

It is an arithmetic number, because the mean of its divisors is an integer number (102227070).

Almost surely, 2^204454139 is an apocalyptic number.

204454139 is a deficient number, since it is larger than the sum of its proper divisors (1).

204454139 is an equidigital number, since it uses as much as digits as its factorization.

204454139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 204454139 is about 14298.7460639036. The cubic root of 204454139 is about 589.1130395872.

The spelling of 204454139 in words is "two hundred four million, four hundred fifty-four thousand, one hundred thirty-nine".